// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 /****************************************************************************** * * Module Name: evxfregn - External Interfaces, ACPI Operation Regions and * Address Spaces. * * Copyright (C) 2000 - 2020, Intel Corp. * *****************************************************************************/ #define EXPORT_ACPI_INTERFACES #include #include "accommon.h" #include "acnamesp.h" #include "acevents.h" #define _COMPONENT ACPI_EVENTS ACPI_MODULE_NAME("evxfregn") /******************************************************************************* * * FUNCTION: acpi_install_address_space_handler * * PARAMETERS: device - Handle for the device * space_id - The address space ID * handler - Address of the handler * setup - Address of the setup function * context - Value passed to the handler on each access * * RETURN: Status * * DESCRIPTION: Install a handler for all op_regions of a given space_id. * * NOTE: This function should only be called after acpi_enable_subsystem has * been called. This is because any _REG methods associated with the Space ID * are executed here, and these methods can only be safely executed after * the default handlers have been installed and the hardware has been * initialized (via acpi_enable_subsystem.) * ******************************************************************************/ acpi_status acpi_install_address_space_handler(acpi_handle device, acpi_adr_space_type space_id, acpi_adr_space_handler handler, acpi_adr_space_setup setup, void *context) { struct acpi_namespace_node *node; acpi_status status; ACPI_FUNCTION_TRACE(acpi_install_address_space_handler); /* Parameter validation */ if (!device) { return_ACPI_STATUS(AE_BAD_PARAMETER); } status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); if (ACPI_FAILURE(status)) { return_ACPI_STATUS(status); } /* Convert and validate the device handle */ node = acpi_ns_validate_handle(device); if (!node) { status = AE_BAD_PARAMETER; goto unlock_and_exit; } /* Install the handler for all Regions for this Space ID */ status = acpi_ev_install_space_handler(node, space_id, handler, setup, context); if (ACPI_FAILURE(status)) { goto unlock_and_exit; } /* Run all _REG methods for this address space */ acpi_ev_execute_reg_methods(node, space_id, ACPI_REG_CONNECT); unlock_and_exit: (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); return_ACPI_STATUS(status); } ACPI_EXPORT_SYMBOL(acpi_install_address_space_handler) /******************************************************************************* * * FUNCTION: acpi_remove_address_space_handler * * PARAMETERS: device - Handle for the device * space_id - The address space ID * handler - Address of the handler * * RETURN: Status * * DESCRIPTION: Remove a previously installed handler. * ******************************************************************************/ acpi_status acpi_remove_address_space_handler(acpi_handle device, acpi_adr_space_type space_id, acpi_adr_space_handler handler) { union acpi_operand_object *obj_desc; union acpi_operand_object *handler_obj; union acpi_operand_object *region_obj; union acpi_operand_object **last_obj_ptr; struct acpi_namespace_node *node; acpi_status status; ACPI_FUNCTION_TRACE(acpi_remove_address_space_handler); /* Parameter validation */ if (!device) { return_ACPI_STATUS(AE_BAD_PARAMETER); } status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); if (ACPI_FAILURE(status)) { return_ACPI_STATUS(status); } /* Convert and validate the device handle */ node = acpi_ns_validate_handle(device); if (!node || ((node->type != ACPI_TYPE_DEVICE) && (node->type != ACPI_TYPE_PROCESSOR) && (node->type != ACPI_TYPE_THERMAL) && (node != acpi_gbl_root_node))) { status = AE_BAD_PARAMETER; goto unlock_and_exit; } /* Make sure the internal object exists */ obj_desc = acpi_ns_get_attached_object(node); if (!obj_desc) { status = AE_NOT_EXIST; goto unlock_and_exit; } /* Find the address handler the user requested */ handler_obj = obj_desc->common_notify.handler; last_obj_ptr = &obj_desc->common_notify.handler; while (handler_obj) { /* We have a handler, see if user requested this one */ if (handler_obj->address_space.space_id == space_id) { /* Handler must be the same as the installed handler */ if (handler_obj->address_space.handler != handler) { status = AE_BAD_PARAMETER; goto unlock_and_exit; } /* Matched space_id, first dereference this in the Regions */ ACPI_DEBUG_PRINT((ACPI_DB_OPREGION, "Removing address handler %p(%p) for region %s " "on Device %p(%p)\n", handler_obj, handler, acpi_ut_get_region_name(space_id), node, obj_desc)); region_obj = handler_obj->address_space.region_list; /* Walk the handler's region list */ while (region_obj) { /* * First disassociate the handler from the region. * * NOTE: this doesn't mean that the region goes away * The region is just inaccessible as indicated to * the _REG method */ acpi_ev_detach_region(region_obj, TRUE); /* * Walk the list: Just grab the head because the * detach_region removed the previous head. */ region_obj = handler_obj->address_space.region_list; } /* Remove this Handler object from the list */ *last_obj_ptr = handler_obj->address_space.next; /* Now we can delete the handler object */ acpi_os_release_mutex(handler_obj->address_space. context_mutex); acpi_ut_remove_reference(handler_obj); goto unlock_and_exit; } /* Walk the linked list of handlers */ last_obj_ptr = &handler_obj->address_space.next; handler_obj = handler_obj->address_space.next; } /* The handler does not exist */ ACPI_DEBUG_PRINT((ACPI_DB_OPREGION, "Unable to remove address handler %p for %s(%X), DevNode %p, obj %p\n", handler, acpi_ut_get_region_name(space_id), space_id, node, obj_desc)); status = AE_NOT_EXIST; unlock_and_exit: (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); return_ACPI_STATUS(status); } ACPI_EXPORT_SYMBOL(acpi_remove_address_space_handler)