1 // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 2 /****************************************************************************** 3 * 4 * Module Name: evxfregn - External Interfaces, ACPI Operation Regions and 5 * Address Spaces. 6 * 7 * Copyright (C) 2000 - 2021, Intel Corp. 8 * 9 *****************************************************************************/ 10 11 #define EXPORT_ACPI_INTERFACES 12 13 #include <acpi/acpi.h> 14 #include "accommon.h" 15 #include "acnamesp.h" 16 #include "acevents.h" 17 18 #define _COMPONENT ACPI_EVENTS 19 ACPI_MODULE_NAME("evxfregn") 20 21 /******************************************************************************* 22 * 23 * FUNCTION: acpi_install_address_space_handler 24 * 25 * PARAMETERS: device - Handle for the device 26 * space_id - The address space ID 27 * handler - Address of the handler 28 * setup - Address of the setup function 29 * context - Value passed to the handler on each access 30 * 31 * RETURN: Status 32 * 33 * DESCRIPTION: Install a handler for all op_regions of a given space_id. 34 * 35 * NOTE: This function should only be called after acpi_enable_subsystem has 36 * been called. This is because any _REG methods associated with the Space ID 37 * are executed here, and these methods can only be safely executed after 38 * the default handlers have been installed and the hardware has been 39 * initialized (via acpi_enable_subsystem.) 40 * 41 ******************************************************************************/ 42 acpi_status 43 acpi_install_address_space_handler(acpi_handle device, 44 acpi_adr_space_type space_id, 45 acpi_adr_space_handler handler, 46 acpi_adr_space_setup setup, void *context) 47 { 48 struct acpi_namespace_node *node; 49 acpi_status status; 50 51 ACPI_FUNCTION_TRACE(acpi_install_address_space_handler); 52 53 /* Parameter validation */ 54 55 if (!device) { 56 return_ACPI_STATUS(AE_BAD_PARAMETER); 57 } 58 59 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); 60 if (ACPI_FAILURE(status)) { 61 return_ACPI_STATUS(status); 62 } 63 64 /* Convert and validate the device handle */ 65 66 node = acpi_ns_validate_handle(device); 67 if (!node) { 68 status = AE_BAD_PARAMETER; 69 goto unlock_and_exit; 70 } 71 72 /* Install the handler for all Regions for this Space ID */ 73 74 status = 75 acpi_ev_install_space_handler(node, space_id, handler, setup, 76 context); 77 if (ACPI_FAILURE(status)) { 78 goto unlock_and_exit; 79 } 80 81 /* Run all _REG methods for this address space */ 82 83 acpi_ev_execute_reg_methods(node, space_id, ACPI_REG_CONNECT); 84 85 unlock_and_exit: 86 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); 87 return_ACPI_STATUS(status); 88 } 89 90 ACPI_EXPORT_SYMBOL(acpi_install_address_space_handler) 91 92 /******************************************************************************* 93 * 94 * FUNCTION: acpi_remove_address_space_handler 95 * 96 * PARAMETERS: device - Handle for the device 97 * space_id - The address space ID 98 * handler - Address of the handler 99 * 100 * RETURN: Status 101 * 102 * DESCRIPTION: Remove a previously installed handler. 103 * 104 ******************************************************************************/ 105 acpi_status 106 acpi_remove_address_space_handler(acpi_handle device, 107 acpi_adr_space_type space_id, 108 acpi_adr_space_handler handler) 109 { 110 union acpi_operand_object *obj_desc; 111 union acpi_operand_object *handler_obj; 112 union acpi_operand_object *region_obj; 113 union acpi_operand_object **last_obj_ptr; 114 struct acpi_namespace_node *node; 115 acpi_status status; 116 117 ACPI_FUNCTION_TRACE(acpi_remove_address_space_handler); 118 119 /* Parameter validation */ 120 121 if (!device) { 122 return_ACPI_STATUS(AE_BAD_PARAMETER); 123 } 124 125 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); 126 if (ACPI_FAILURE(status)) { 127 return_ACPI_STATUS(status); 128 } 129 130 /* Convert and validate the device handle */ 131 132 node = acpi_ns_validate_handle(device); 133 if (!node || 134 ((node->type != ACPI_TYPE_DEVICE) && 135 (node->type != ACPI_TYPE_PROCESSOR) && 136 (node->type != ACPI_TYPE_THERMAL) && 137 (node != acpi_gbl_root_node))) { 138 status = AE_BAD_PARAMETER; 139 goto unlock_and_exit; 140 } 141 142 /* Make sure the internal object exists */ 143 144 obj_desc = acpi_ns_get_attached_object(node); 145 if (!obj_desc) { 146 status = AE_NOT_EXIST; 147 goto unlock_and_exit; 148 } 149 150 /* Find the address handler the user requested */ 151 152 handler_obj = obj_desc->common_notify.handler; 153 last_obj_ptr = &obj_desc->common_notify.handler; 154 while (handler_obj) { 155 156 /* We have a handler, see if user requested this one */ 157 158 if (handler_obj->address_space.space_id == space_id) { 159 160 /* Handler must be the same as the installed handler */ 161 162 if (handler_obj->address_space.handler != handler) { 163 status = AE_BAD_PARAMETER; 164 goto unlock_and_exit; 165 } 166 167 /* Matched space_id, first dereference this in the Regions */ 168 169 ACPI_DEBUG_PRINT((ACPI_DB_OPREGION, 170 "Removing address handler %p(%p) for region %s " 171 "on Device %p(%p)\n", 172 handler_obj, handler, 173 acpi_ut_get_region_name(space_id), 174 node, obj_desc)); 175 176 region_obj = handler_obj->address_space.region_list; 177 178 /* Walk the handler's region list */ 179 180 while (region_obj) { 181 /* 182 * First disassociate the handler from the region. 183 * 184 * NOTE: this doesn't mean that the region goes away 185 * The region is just inaccessible as indicated to 186 * the _REG method 187 */ 188 acpi_ev_detach_region(region_obj, TRUE); 189 190 /* 191 * Walk the list: Just grab the head because the 192 * detach_region removed the previous head. 193 */ 194 region_obj = 195 handler_obj->address_space.region_list; 196 } 197 198 /* Remove this Handler object from the list */ 199 200 *last_obj_ptr = handler_obj->address_space.next; 201 202 /* Now we can delete the handler object */ 203 204 acpi_os_release_mutex(handler_obj->address_space. 205 context_mutex); 206 acpi_ut_remove_reference(handler_obj); 207 goto unlock_and_exit; 208 } 209 210 /* Walk the linked list of handlers */ 211 212 last_obj_ptr = &handler_obj->address_space.next; 213 handler_obj = handler_obj->address_space.next; 214 } 215 216 /* The handler does not exist */ 217 218 ACPI_DEBUG_PRINT((ACPI_DB_OPREGION, 219 "Unable to remove address handler %p for %s(%X), DevNode %p, obj %p\n", 220 handler, acpi_ut_get_region_name(space_id), space_id, 221 node, obj_desc)); 222 223 status = AE_NOT_EXIST; 224 225 unlock_and_exit: 226 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); 227 return_ACPI_STATUS(status); 228 } 229 230 ACPI_EXPORT_SYMBOL(acpi_remove_address_space_handler) 231