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230 lines
6.3 KiB
230 lines
6.3 KiB
// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 |
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/****************************************************************************** |
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* |
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* Module Name: evxfregn - External Interfaces, ACPI Operation Regions and |
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* Address Spaces. |
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* |
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* Copyright (C) 2000 - 2021, Intel Corp. |
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* |
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*****************************************************************************/ |
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#define EXPORT_ACPI_INTERFACES |
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#include <acpi/acpi.h> |
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#include "accommon.h" |
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#include "acnamesp.h" |
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#include "acevents.h" |
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#define _COMPONENT ACPI_EVENTS |
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ACPI_MODULE_NAME("evxfregn") |
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/******************************************************************************* |
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* |
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* FUNCTION: acpi_install_address_space_handler |
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* |
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* PARAMETERS: device - Handle for the device |
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* space_id - The address space ID |
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* handler - Address of the handler |
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* setup - Address of the setup function |
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* context - Value passed to the handler on each access |
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* |
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* RETURN: Status |
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* |
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* DESCRIPTION: Install a handler for all op_regions of a given space_id. |
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* |
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* NOTE: This function should only be called after acpi_enable_subsystem has |
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* been called. This is because any _REG methods associated with the Space ID |
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* are executed here, and these methods can only be safely executed after |
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* the default handlers have been installed and the hardware has been |
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* initialized (via acpi_enable_subsystem.) |
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* |
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******************************************************************************/ |
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acpi_status |
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acpi_install_address_space_handler(acpi_handle device, |
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acpi_adr_space_type space_id, |
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acpi_adr_space_handler handler, |
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acpi_adr_space_setup setup, void *context) |
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{ |
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struct acpi_namespace_node *node; |
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acpi_status status; |
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ACPI_FUNCTION_TRACE(acpi_install_address_space_handler); |
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/* Parameter validation */ |
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if (!device) { |
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return_ACPI_STATUS(AE_BAD_PARAMETER); |
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} |
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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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/* Convert and validate the device handle */ |
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node = acpi_ns_validate_handle(device); |
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if (!node) { |
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status = AE_BAD_PARAMETER; |
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goto unlock_and_exit; |
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} |
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/* Install the handler for all Regions for this Space ID */ |
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status = |
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acpi_ev_install_space_handler(node, space_id, handler, setup, |
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context); |
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if (ACPI_FAILURE(status)) { |
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goto unlock_and_exit; |
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} |
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/* Run all _REG methods for this address space */ |
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acpi_ev_execute_reg_methods(node, space_id, ACPI_REG_CONNECT); |
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unlock_and_exit: |
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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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ACPI_EXPORT_SYMBOL(acpi_install_address_space_handler) |
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/******************************************************************************* |
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* |
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* FUNCTION: acpi_remove_address_space_handler |
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* |
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* PARAMETERS: device - Handle for the device |
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* space_id - The address space ID |
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* handler - Address of the handler |
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* |
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* RETURN: Status |
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* |
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* DESCRIPTION: Remove a previously installed handler. |
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* |
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******************************************************************************/ |
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acpi_status |
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acpi_remove_address_space_handler(acpi_handle device, |
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acpi_adr_space_type space_id, |
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acpi_adr_space_handler handler) |
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{ |
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union acpi_operand_object *obj_desc; |
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union acpi_operand_object *handler_obj; |
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union acpi_operand_object *region_obj; |
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union acpi_operand_object **last_obj_ptr; |
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struct acpi_namespace_node *node; |
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acpi_status status; |
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ACPI_FUNCTION_TRACE(acpi_remove_address_space_handler); |
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/* Parameter validation */ |
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if (!device) { |
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return_ACPI_STATUS(AE_BAD_PARAMETER); |
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} |
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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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/* Convert and validate the device handle */ |
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node = acpi_ns_validate_handle(device); |
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if (!node || |
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((node->type != ACPI_TYPE_DEVICE) && |
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(node->type != ACPI_TYPE_PROCESSOR) && |
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(node->type != ACPI_TYPE_THERMAL) && |
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(node != acpi_gbl_root_node))) { |
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status = AE_BAD_PARAMETER; |
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goto unlock_and_exit; |
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} |
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/* Make sure the internal object exists */ |
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obj_desc = acpi_ns_get_attached_object(node); |
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if (!obj_desc) { |
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status = AE_NOT_EXIST; |
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goto unlock_and_exit; |
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} |
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/* Find the address handler the user requested */ |
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handler_obj = obj_desc->common_notify.handler; |
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last_obj_ptr = &obj_desc->common_notify.handler; |
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while (handler_obj) { |
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/* We have a handler, see if user requested this one */ |
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if (handler_obj->address_space.space_id == space_id) { |
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/* Handler must be the same as the installed handler */ |
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if (handler_obj->address_space.handler != handler) { |
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status = AE_BAD_PARAMETER; |
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goto unlock_and_exit; |
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} |
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/* Matched space_id, first dereference this in the Regions */ |
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ACPI_DEBUG_PRINT((ACPI_DB_OPREGION, |
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"Removing address handler %p(%p) for region %s " |
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"on Device %p(%p)\n", |
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handler_obj, handler, |
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acpi_ut_get_region_name(space_id), |
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node, obj_desc)); |
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region_obj = handler_obj->address_space.region_list; |
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/* Walk the handler's region list */ |
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while (region_obj) { |
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/* |
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* First disassociate the handler from the region. |
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* |
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* NOTE: this doesn't mean that the region goes away |
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* The region is just inaccessible as indicated to |
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* the _REG method |
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*/ |
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acpi_ev_detach_region(region_obj, TRUE); |
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/* |
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* Walk the list: Just grab the head because the |
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* detach_region removed the previous head. |
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*/ |
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region_obj = |
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handler_obj->address_space.region_list; |
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} |
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/* Remove this Handler object from the list */ |
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*last_obj_ptr = handler_obj->address_space.next; |
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/* Now we can delete the handler object */ |
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acpi_os_release_mutex(handler_obj->address_space. |
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context_mutex); |
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acpi_ut_remove_reference(handler_obj); |
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goto unlock_and_exit; |
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} |
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/* Walk the linked list of handlers */ |
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last_obj_ptr = &handler_obj->address_space.next; |
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handler_obj = handler_obj->address_space.next; |
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} |
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/* The handler does not exist */ |
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ACPI_DEBUG_PRINT((ACPI_DB_OPREGION, |
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"Unable to remove address handler %p for %s(%X), DevNode %p, obj %p\n", |
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handler, acpi_ut_get_region_name(space_id), space_id, |
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node, obj_desc)); |
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status = AE_NOT_EXIST; |
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unlock_and_exit: |
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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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ACPI_EXPORT_SYMBOL(acpi_remove_address_space_handler)
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