![Bob Moore](/assets/img/avatar_default.png)
All tool/utility signons. Dual-license module header. Signed-off-by: Bob Moore <robert.moore@intel.com> Signed-off-by: Lv Zheng <lv.zheng@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
880 lines
26 KiB
C
880 lines
26 KiB
C
/******************************************************************************
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*
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* Module Name: evregion - Operation Region support
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*
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*****************************************************************************/
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/*
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* Copyright (C) 2000 - 2016, Intel Corp.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions, and the following disclaimer,
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* without modification.
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* 2. Redistributions in binary form must reproduce at minimum a disclaimer
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* substantially similar to the "NO WARRANTY" disclaimer below
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* ("Disclaimer") and any redistribution must be conditioned upon
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* including a substantially similar Disclaimer requirement for further
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* binary redistribution.
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* 3. Neither the names of the above-listed copyright holders nor the names
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* of any contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* NO WARRANTY
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGES.
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*/
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#include <acpi/acpi.h>
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#include "accommon.h"
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#include "acevents.h"
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#include "acnamesp.h"
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#include "acinterp.h"
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#define _COMPONENT ACPI_EVENTS
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ACPI_MODULE_NAME("evregion")
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extern u8 acpi_gbl_default_address_spaces[];
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/* Local prototypes */
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static void
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acpi_ev_orphan_ec_reg_method(struct acpi_namespace_node *ec_device_node);
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static acpi_status
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acpi_ev_reg_run(acpi_handle obj_handle,
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u32 level, void *context, void **return_value);
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/*******************************************************************************
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*
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* FUNCTION: acpi_ev_initialize_op_regions
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*
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* PARAMETERS: None
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*
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* RETURN: Status
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*
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* DESCRIPTION: Execute _REG methods for all Operation Regions that have
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* an installed default region handler.
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*
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******************************************************************************/
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acpi_status acpi_ev_initialize_op_regions(void)
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{
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acpi_status status;
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u32 i;
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ACPI_FUNCTION_TRACE(ev_initialize_op_regions);
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status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
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if (ACPI_FAILURE(status)) {
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return_ACPI_STATUS(status);
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}
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/* Run the _REG methods for op_regions in each default address space */
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for (i = 0; i < ACPI_NUM_DEFAULT_SPACES; i++) {
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/*
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* Make sure the installed handler is the DEFAULT handler. If not the
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* default, the _REG methods will have already been run (when the
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* handler was installed)
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*/
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if (acpi_ev_has_default_handler(acpi_gbl_root_node,
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acpi_gbl_default_address_spaces
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[i])) {
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acpi_ev_execute_reg_methods(acpi_gbl_root_node,
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acpi_gbl_default_address_spaces
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[i], ACPI_REG_CONNECT);
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}
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}
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(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
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return_ACPI_STATUS(status);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ev_address_space_dispatch
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*
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* PARAMETERS: region_obj - Internal region object
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* field_obj - Corresponding field. Can be NULL.
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* function - Read or Write operation
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* region_offset - Where in the region to read or write
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* bit_width - Field width in bits (8, 16, 32, or 64)
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* value - Pointer to in or out value, must be
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* a full 64-bit integer
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*
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* RETURN: Status
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*
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* DESCRIPTION: Dispatch an address space or operation region access to
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* a previously installed handler.
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*
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* NOTE: During early initialization, we always install the default region
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* handlers for Memory, I/O and PCI_Config. This ensures that these operation
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* region address spaces are always available as per the ACPI specification.
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* This is especially needed in order to support the execution of
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* module-level AML code during loading of the ACPI tables.
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*
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******************************************************************************/
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acpi_status
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acpi_ev_address_space_dispatch(union acpi_operand_object *region_obj,
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union acpi_operand_object *field_obj,
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u32 function,
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u32 region_offset, u32 bit_width, u64 *value)
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{
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acpi_status status;
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acpi_adr_space_handler handler;
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acpi_adr_space_setup region_setup;
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union acpi_operand_object *handler_desc;
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union acpi_operand_object *region_obj2;
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void *region_context = NULL;
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struct acpi_connection_info *context;
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acpi_physical_address address;
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ACPI_FUNCTION_TRACE(ev_address_space_dispatch);
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region_obj2 = acpi_ns_get_secondary_object(region_obj);
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if (!region_obj2) {
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return_ACPI_STATUS(AE_NOT_EXIST);
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}
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/* Ensure that there is a handler associated with this region */
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handler_desc = region_obj->region.handler;
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if (!handler_desc) {
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ACPI_ERROR((AE_INFO,
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"No handler for Region [%4.4s] (%p) [%s]",
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acpi_ut_get_node_name(region_obj->region.node),
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region_obj,
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acpi_ut_get_region_name(region_obj->region.
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space_id)));
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return_ACPI_STATUS(AE_NOT_EXIST);
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}
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context = handler_desc->address_space.context;
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/*
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* It may be the case that the region has never been initialized.
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* Some types of regions require special init code
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*/
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if (!(region_obj->region.flags & AOPOBJ_SETUP_COMPLETE)) {
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/* This region has not been initialized yet, do it */
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region_setup = handler_desc->address_space.setup;
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if (!region_setup) {
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/* No initialization routine, exit with error */
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ACPI_ERROR((AE_INFO,
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"No init routine for region(%p) [%s]",
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region_obj,
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acpi_ut_get_region_name(region_obj->region.
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space_id)));
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return_ACPI_STATUS(AE_NOT_EXIST);
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}
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/*
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* We must exit the interpreter because the region setup will
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* potentially execute control methods (for example, the _REG method
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* for this region)
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*/
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acpi_ex_exit_interpreter();
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status = region_setup(region_obj, ACPI_REGION_ACTIVATE,
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context, ®ion_context);
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/* Re-enter the interpreter */
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acpi_ex_enter_interpreter();
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/* Check for failure of the Region Setup */
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if (ACPI_FAILURE(status)) {
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ACPI_EXCEPTION((AE_INFO, status,
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"During region initialization: [%s]",
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acpi_ut_get_region_name(region_obj->
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region.
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space_id)));
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return_ACPI_STATUS(status);
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}
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/* Region initialization may have been completed by region_setup */
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if (!(region_obj->region.flags & AOPOBJ_SETUP_COMPLETE)) {
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region_obj->region.flags |= AOPOBJ_SETUP_COMPLETE;
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/*
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* Save the returned context for use in all accesses to
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* the handler for this particular region
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*/
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if (!(region_obj2->extra.region_context)) {
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region_obj2->extra.region_context =
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region_context;
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}
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}
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}
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/* We have everything we need, we can invoke the address space handler */
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handler = handler_desc->address_space.handler;
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address = (region_obj->region.address + region_offset);
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/*
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* Special handling for generic_serial_bus and general_purpose_io:
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* There are three extra parameters that must be passed to the
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* handler via the context:
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* 1) Connection buffer, a resource template from Connection() op
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* 2) Length of the above buffer
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* 3) Actual access length from the access_as() op
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*
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* In addition, for general_purpose_io, the Address and bit_width fields
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* are defined as follows:
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* 1) Address is the pin number index of the field (bit offset from
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* the previous Connection)
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* 2) bit_width is the actual bit length of the field (number of pins)
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*/
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if ((region_obj->region.space_id == ACPI_ADR_SPACE_GSBUS) &&
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context && field_obj) {
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/* Get the Connection (resource_template) buffer */
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context->connection = field_obj->field.resource_buffer;
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context->length = field_obj->field.resource_length;
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context->access_length = field_obj->field.access_length;
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}
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if ((region_obj->region.space_id == ACPI_ADR_SPACE_GPIO) &&
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context && field_obj) {
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/* Get the Connection (resource_template) buffer */
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context->connection = field_obj->field.resource_buffer;
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context->length = field_obj->field.resource_length;
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context->access_length = field_obj->field.access_length;
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address = field_obj->field.pin_number_index;
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bit_width = field_obj->field.bit_length;
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}
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ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
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"Handler %p (@%p) Address %8.8X%8.8X [%s]\n",
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®ion_obj->region.handler->address_space, handler,
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ACPI_FORMAT_UINT64(address),
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acpi_ut_get_region_name(region_obj->region.
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space_id)));
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if (!(handler_desc->address_space.handler_flags &
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ACPI_ADDR_HANDLER_DEFAULT_INSTALLED)) {
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/*
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* For handlers other than the default (supplied) handlers, we must
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* exit the interpreter because the handler *might* block -- we don't
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* know what it will do, so we can't hold the lock on the intepreter.
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*/
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acpi_ex_exit_interpreter();
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}
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/* Call the handler */
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status = handler(function, address, bit_width, value, context,
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region_obj2->extra.region_context);
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if (ACPI_FAILURE(status)) {
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ACPI_EXCEPTION((AE_INFO, status, "Returned by Handler for [%s]",
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acpi_ut_get_region_name(region_obj->region.
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space_id)));
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}
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if (!(handler_desc->address_space.handler_flags &
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ACPI_ADDR_HANDLER_DEFAULT_INSTALLED)) {
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/*
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* We just returned from a non-default handler, we must re-enter the
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* interpreter
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*/
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acpi_ex_enter_interpreter();
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}
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return_ACPI_STATUS(status);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ev_detach_region
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*
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* PARAMETERS: region_obj - Region Object
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* acpi_ns_is_locked - Namespace Region Already Locked?
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*
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* RETURN: None
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*
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* DESCRIPTION: Break the association between the handler and the region
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* this is a two way association.
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*
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******************************************************************************/
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void
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acpi_ev_detach_region(union acpi_operand_object *region_obj,
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u8 acpi_ns_is_locked)
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{
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union acpi_operand_object *handler_obj;
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union acpi_operand_object *obj_desc;
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union acpi_operand_object *start_desc;
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union acpi_operand_object **last_obj_ptr;
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acpi_adr_space_setup region_setup;
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void **region_context;
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union acpi_operand_object *region_obj2;
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acpi_status status;
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ACPI_FUNCTION_TRACE(ev_detach_region);
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region_obj2 = acpi_ns_get_secondary_object(region_obj);
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if (!region_obj2) {
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return_VOID;
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}
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region_context = ®ion_obj2->extra.region_context;
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/* Get the address handler from the region object */
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handler_obj = region_obj->region.handler;
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if (!handler_obj) {
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/* This region has no handler, all done */
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return_VOID;
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}
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/* Find this region in the handler's list */
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obj_desc = handler_obj->address_space.region_list;
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start_desc = obj_desc;
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last_obj_ptr = &handler_obj->address_space.region_list;
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while (obj_desc) {
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/* Is this the correct Region? */
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if (obj_desc == region_obj) {
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ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
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"Removing Region %p from address handler %p\n",
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region_obj, handler_obj));
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/* This is it, remove it from the handler's list */
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*last_obj_ptr = obj_desc->region.next;
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obj_desc->region.next = NULL; /* Must clear field */
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if (acpi_ns_is_locked) {
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status =
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acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
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if (ACPI_FAILURE(status)) {
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return_VOID;
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}
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}
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/* Now stop region accesses by executing the _REG method */
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status =
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acpi_ev_execute_reg_method(region_obj,
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ACPI_REG_DISCONNECT);
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if (ACPI_FAILURE(status)) {
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ACPI_EXCEPTION((AE_INFO, status,
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"from region _REG, [%s]",
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acpi_ut_get_region_name
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(region_obj->region.space_id)));
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}
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if (acpi_ns_is_locked) {
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status =
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acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
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if (ACPI_FAILURE(status)) {
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return_VOID;
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}
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}
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/*
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* If the region has been activated, call the setup handler with
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* the deactivate notification
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*/
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if (region_obj->region.flags & AOPOBJ_SETUP_COMPLETE) {
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region_setup = handler_obj->address_space.setup;
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status =
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region_setup(region_obj,
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ACPI_REGION_DEACTIVATE,
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handler_obj->address_space.
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context, region_context);
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/*
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* region_context should have been released by the deactivate
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* operation. We don't need access to it anymore here.
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*/
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if (region_context) {
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*region_context = NULL;
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}
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/* Init routine may fail, Just ignore errors */
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if (ACPI_FAILURE(status)) {
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ACPI_EXCEPTION((AE_INFO, status,
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"from region handler - deactivate, [%s]",
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acpi_ut_get_region_name
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(region_obj->region.
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space_id)));
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}
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region_obj->region.flags &=
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~(AOPOBJ_SETUP_COMPLETE);
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}
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/*
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* Remove handler reference in the region
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*
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* NOTE: this doesn't mean that the region goes away, the region
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* is just inaccessible as indicated to the _REG method
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*
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* If the region is on the handler's list, this must be the
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* region's handler
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*/
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region_obj->region.handler = NULL;
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acpi_ut_remove_reference(handler_obj);
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return_VOID;
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}
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/* Walk the linked list of handlers */
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last_obj_ptr = &obj_desc->region.next;
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obj_desc = obj_desc->region.next;
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/* Prevent infinite loop if list is corrupted */
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if (obj_desc == start_desc) {
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ACPI_ERROR((AE_INFO,
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"Circular handler list in region object %p",
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region_obj));
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return_VOID;
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}
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}
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/* If we get here, the region was not in the handler's region list */
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ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
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"Cannot remove region %p from address handler %p\n",
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region_obj, handler_obj));
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return_VOID;
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ev_attach_region
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*
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* PARAMETERS: handler_obj - Handler Object
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* region_obj - Region Object
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* acpi_ns_is_locked - Namespace Region Already Locked?
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*
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* RETURN: None
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*
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* DESCRIPTION: Create the association between the handler and the region
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* this is a two way association.
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*
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******************************************************************************/
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acpi_status
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acpi_ev_attach_region(union acpi_operand_object *handler_obj,
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union acpi_operand_object *region_obj,
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u8 acpi_ns_is_locked)
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{
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ACPI_FUNCTION_TRACE(ev_attach_region);
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/* Install the region's handler */
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if (region_obj->region.handler) {
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return_ACPI_STATUS(AE_ALREADY_EXISTS);
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}
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ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
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"Adding Region [%4.4s] %p to address handler %p [%s]\n",
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acpi_ut_get_node_name(region_obj->region.node),
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region_obj, handler_obj,
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acpi_ut_get_region_name(region_obj->region.
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space_id)));
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/* Link this region to the front of the handler's list */
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region_obj->region.next = handler_obj->address_space.region_list;
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handler_obj->address_space.region_list = region_obj;
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region_obj->region.handler = handler_obj;
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acpi_ut_add_reference(handler_obj);
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return_ACPI_STATUS(AE_OK);
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}
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/*******************************************************************************
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*
|
|
* FUNCTION: acpi_ev_associate_reg_method
|
|
*
|
|
* PARAMETERS: region_obj - Region object
|
|
*
|
|
* RETURN: Status
|
|
*
|
|
* DESCRIPTION: Find and associate _REG method to a region
|
|
*
|
|
******************************************************************************/
|
|
|
|
void acpi_ev_associate_reg_method(union acpi_operand_object *region_obj)
|
|
{
|
|
acpi_name *reg_name_ptr = (acpi_name *) METHOD_NAME__REG;
|
|
struct acpi_namespace_node *method_node;
|
|
struct acpi_namespace_node *node;
|
|
union acpi_operand_object *region_obj2;
|
|
acpi_status status;
|
|
|
|
ACPI_FUNCTION_TRACE(ev_associate_reg_method);
|
|
|
|
region_obj2 = acpi_ns_get_secondary_object(region_obj);
|
|
if (!region_obj2) {
|
|
return_VOID;
|
|
}
|
|
|
|
node = region_obj->region.node->parent;
|
|
|
|
/* Find any "_REG" method associated with this region definition */
|
|
|
|
status =
|
|
acpi_ns_search_one_scope(*reg_name_ptr, node, ACPI_TYPE_METHOD,
|
|
&method_node);
|
|
if (ACPI_SUCCESS(status)) {
|
|
/*
|
|
* The _REG method is optional and there can be only one per region
|
|
* definition. This will be executed when the handler is attached
|
|
* or removed
|
|
*/
|
|
region_obj2->extra.method_REG = method_node;
|
|
}
|
|
|
|
return_VOID;
|
|
}
|
|
|
|
/*******************************************************************************
|
|
*
|
|
* FUNCTION: acpi_ev_execute_reg_method
|
|
*
|
|
* PARAMETERS: region_obj - Region object
|
|
* function - Passed to _REG: On (1) or Off (0)
|
|
*
|
|
* RETURN: Status
|
|
*
|
|
* DESCRIPTION: Execute _REG method for a region
|
|
*
|
|
******************************************************************************/
|
|
|
|
acpi_status
|
|
acpi_ev_execute_reg_method(union acpi_operand_object *region_obj, u32 function)
|
|
{
|
|
struct acpi_evaluate_info *info;
|
|
union acpi_operand_object *args[3];
|
|
union acpi_operand_object *region_obj2;
|
|
acpi_status status;
|
|
|
|
ACPI_FUNCTION_TRACE(ev_execute_reg_method);
|
|
|
|
region_obj2 = acpi_ns_get_secondary_object(region_obj);
|
|
if (!region_obj2) {
|
|
return_ACPI_STATUS(AE_NOT_EXIST);
|
|
}
|
|
|
|
if (region_obj2->extra.method_REG == NULL ||
|
|
region_obj->region.handler == NULL ||
|
|
!acpi_gbl_reg_methods_enabled) {
|
|
return_ACPI_STATUS(AE_OK);
|
|
}
|
|
|
|
/* _REG(DISCONNECT) should be paired with _REG(CONNECT) */
|
|
|
|
if ((function == ACPI_REG_CONNECT &&
|
|
region_obj->common.flags & AOPOBJ_REG_CONNECTED) ||
|
|
(function == ACPI_REG_DISCONNECT &&
|
|
!(region_obj->common.flags & AOPOBJ_REG_CONNECTED))) {
|
|
return_ACPI_STATUS(AE_OK);
|
|
}
|
|
|
|
/* Allocate and initialize the evaluation information block */
|
|
|
|
info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info));
|
|
if (!info) {
|
|
return_ACPI_STATUS(AE_NO_MEMORY);
|
|
}
|
|
|
|
info->prefix_node = region_obj2->extra.method_REG;
|
|
info->relative_pathname = NULL;
|
|
info->parameters = args;
|
|
info->flags = ACPI_IGNORE_RETURN_VALUE;
|
|
|
|
/*
|
|
* The _REG method has two arguments:
|
|
*
|
|
* arg0 - Integer:
|
|
* Operation region space ID Same value as region_obj->Region.space_id
|
|
*
|
|
* arg1 - Integer:
|
|
* connection status 1 for connecting the handler, 0 for disconnecting
|
|
* the handler (Passed as a parameter)
|
|
*/
|
|
args[0] =
|
|
acpi_ut_create_integer_object((u64)region_obj->region.space_id);
|
|
if (!args[0]) {
|
|
status = AE_NO_MEMORY;
|
|
goto cleanup1;
|
|
}
|
|
|
|
args[1] = acpi_ut_create_integer_object((u64)function);
|
|
if (!args[1]) {
|
|
status = AE_NO_MEMORY;
|
|
goto cleanup2;
|
|
}
|
|
|
|
args[2] = NULL; /* Terminate list */
|
|
|
|
/* Execute the method, no return value */
|
|
|
|
ACPI_DEBUG_EXEC(acpi_ut_display_init_pathname
|
|
(ACPI_TYPE_METHOD, info->prefix_node, NULL));
|
|
|
|
status = acpi_ns_evaluate(info);
|
|
acpi_ut_remove_reference(args[1]);
|
|
|
|
if (ACPI_FAILURE(status)) {
|
|
goto cleanup2;
|
|
}
|
|
|
|
if (function == ACPI_REG_CONNECT) {
|
|
region_obj->common.flags |= AOPOBJ_REG_CONNECTED;
|
|
} else {
|
|
region_obj->common.flags &= ~AOPOBJ_REG_CONNECTED;
|
|
}
|
|
|
|
cleanup2:
|
|
acpi_ut_remove_reference(args[0]);
|
|
|
|
cleanup1:
|
|
ACPI_FREE(info);
|
|
return_ACPI_STATUS(status);
|
|
}
|
|
|
|
/*******************************************************************************
|
|
*
|
|
* FUNCTION: acpi_ev_execute_reg_methods
|
|
*
|
|
* PARAMETERS: node - Namespace node for the device
|
|
* space_id - The address space ID
|
|
* function - Passed to _REG: On (1) or Off (0)
|
|
*
|
|
* RETURN: None
|
|
*
|
|
* DESCRIPTION: Run all _REG methods for the input Space ID;
|
|
* Note: assumes namespace is locked, or system init time.
|
|
*
|
|
******************************************************************************/
|
|
|
|
void
|
|
acpi_ev_execute_reg_methods(struct acpi_namespace_node *node,
|
|
acpi_adr_space_type space_id, u32 function)
|
|
{
|
|
struct acpi_reg_walk_info info;
|
|
|
|
ACPI_FUNCTION_TRACE(ev_execute_reg_methods);
|
|
|
|
info.space_id = space_id;
|
|
info.function = function;
|
|
info.reg_run_count = 0;
|
|
|
|
ACPI_DEBUG_PRINT_RAW((ACPI_DB_NAMES,
|
|
" Running _REG methods for SpaceId %s\n",
|
|
acpi_ut_get_region_name(info.space_id)));
|
|
|
|
/*
|
|
* Run all _REG methods for all Operation Regions for this space ID. This
|
|
* is a separate walk in order to handle any interdependencies between
|
|
* regions and _REG methods. (i.e. handlers must be installed for all
|
|
* regions of this Space ID before we can run any _REG methods)
|
|
*/
|
|
(void)acpi_ns_walk_namespace(ACPI_TYPE_ANY, node, ACPI_UINT32_MAX,
|
|
ACPI_NS_WALK_UNLOCK, acpi_ev_reg_run, NULL,
|
|
&info, NULL);
|
|
|
|
/* Special case for EC: handle "orphan" _REG methods with no region */
|
|
|
|
if (space_id == ACPI_ADR_SPACE_EC) {
|
|
acpi_ev_orphan_ec_reg_method(node);
|
|
}
|
|
|
|
ACPI_DEBUG_PRINT_RAW((ACPI_DB_NAMES,
|
|
" Executed %u _REG methods for SpaceId %s\n",
|
|
info.reg_run_count,
|
|
acpi_ut_get_region_name(info.space_id)));
|
|
|
|
return_VOID;
|
|
}
|
|
|
|
/*******************************************************************************
|
|
*
|
|
* FUNCTION: acpi_ev_reg_run
|
|
*
|
|
* PARAMETERS: walk_namespace callback
|
|
*
|
|
* DESCRIPTION: Run _REG method for region objects of the requested spaceID
|
|
*
|
|
******************************************************************************/
|
|
|
|
static acpi_status
|
|
acpi_ev_reg_run(acpi_handle obj_handle,
|
|
u32 level, void *context, void **return_value)
|
|
{
|
|
union acpi_operand_object *obj_desc;
|
|
struct acpi_namespace_node *node;
|
|
acpi_status status;
|
|
struct acpi_reg_walk_info *info;
|
|
|
|
info = ACPI_CAST_PTR(struct acpi_reg_walk_info, context);
|
|
|
|
/* Convert and validate the device handle */
|
|
|
|
node = acpi_ns_validate_handle(obj_handle);
|
|
if (!node) {
|
|
return (AE_BAD_PARAMETER);
|
|
}
|
|
|
|
/*
|
|
* We only care about regions.and objects that are allowed to have address
|
|
* space handlers
|
|
*/
|
|
if ((node->type != ACPI_TYPE_REGION) && (node != acpi_gbl_root_node)) {
|
|
return (AE_OK);
|
|
}
|
|
|
|
/* Check for an existing internal object */
|
|
|
|
obj_desc = acpi_ns_get_attached_object(node);
|
|
if (!obj_desc) {
|
|
|
|
/* No object, just exit */
|
|
|
|
return (AE_OK);
|
|
}
|
|
|
|
/* Object is a Region */
|
|
|
|
if (obj_desc->region.space_id != info->space_id) {
|
|
|
|
/* This region is for a different address space, just ignore it */
|
|
|
|
return (AE_OK);
|
|
}
|
|
|
|
info->reg_run_count++;
|
|
status = acpi_ev_execute_reg_method(obj_desc, info->function);
|
|
return (status);
|
|
}
|
|
|
|
/*******************************************************************************
|
|
*
|
|
* FUNCTION: acpi_ev_orphan_ec_reg_method
|
|
*
|
|
* PARAMETERS: ec_device_node - Namespace node for an EC device
|
|
*
|
|
* RETURN: None
|
|
*
|
|
* DESCRIPTION: Execute an "orphan" _REG method that appears under the EC
|
|
* device. This is a _REG method that has no corresponding region
|
|
* within the EC device scope. The orphan _REG method appears to
|
|
* have been enabled by the description of the ECDT in the ACPI
|
|
* specification: "The availability of the region space can be
|
|
* detected by providing a _REG method object underneath the
|
|
* Embedded Controller device."
|
|
*
|
|
* To quickly access the EC device, we use the ec_device_node used
|
|
* during EC handler installation. Otherwise, we would need to
|
|
* perform a time consuming namespace walk, executing _HID
|
|
* methods to find the EC device.
|
|
*
|
|
* MUTEX: Assumes the namespace is locked
|
|
*
|
|
******************************************************************************/
|
|
|
|
static void
|
|
acpi_ev_orphan_ec_reg_method(struct acpi_namespace_node *ec_device_node)
|
|
{
|
|
acpi_handle reg_method;
|
|
struct acpi_namespace_node *next_node;
|
|
acpi_status status;
|
|
struct acpi_object_list args;
|
|
union acpi_object objects[2];
|
|
|
|
ACPI_FUNCTION_TRACE(ev_orphan_ec_reg_method);
|
|
|
|
if (!ec_device_node) {
|
|
return_VOID;
|
|
}
|
|
|
|
/* Namespace is currently locked, must release */
|
|
|
|
(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
|
|
|
|
/* Get a handle to a _REG method immediately under the EC device */
|
|
|
|
status = acpi_get_handle(ec_device_node, METHOD_NAME__REG, ®_method);
|
|
if (ACPI_FAILURE(status)) {
|
|
goto exit; /* There is no _REG method present */
|
|
}
|
|
|
|
/*
|
|
* Execute the _REG method only if there is no Operation Region in
|
|
* this scope with the Embedded Controller space ID. Otherwise, it
|
|
* will already have been executed. Note, this allows for Regions
|
|
* with other space IDs to be present; but the code below will then
|
|
* execute the _REG method with the embedded_control space_ID argument.
|
|
*/
|
|
next_node = acpi_ns_get_next_node(ec_device_node, NULL);
|
|
while (next_node) {
|
|
if ((next_node->type == ACPI_TYPE_REGION) &&
|
|
(next_node->object) &&
|
|
(next_node->object->region.space_id == ACPI_ADR_SPACE_EC)) {
|
|
goto exit; /* Do not execute the _REG */
|
|
}
|
|
|
|
next_node = acpi_ns_get_next_node(ec_device_node, next_node);
|
|
}
|
|
|
|
/* Evaluate the _REG(embedded_control,Connect) method */
|
|
|
|
args.count = 2;
|
|
args.pointer = objects;
|
|
objects[0].type = ACPI_TYPE_INTEGER;
|
|
objects[0].integer.value = ACPI_ADR_SPACE_EC;
|
|
objects[1].type = ACPI_TYPE_INTEGER;
|
|
objects[1].integer.value = ACPI_REG_CONNECT;
|
|
|
|
status = acpi_evaluate_object(reg_method, NULL, &args, NULL);
|
|
|
|
exit:
|
|
/* We ignore all errors from above, don't care */
|
|
|
|
status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
|
|
return_VOID;
|
|
}
|