1 /****************************************************************************** 2 * 3 * Module Name: evxfregn - External Interfaces, ACPI Operation Regions and 4 * Address Spaces. 5 * 6 *****************************************************************************/ 7 8 /* 9 * Copyright (C) 2000 - 2011, Intel Corp. 10 * All rights reserved. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions, and the following disclaimer, 17 * without modification. 18 * 2. Redistributions in binary form must reproduce at minimum a disclaimer 19 * substantially similar to the "NO WARRANTY" disclaimer below 20 * ("Disclaimer") and any redistribution must be conditioned upon 21 * including a substantially similar Disclaimer requirement for further 22 * binary redistribution. 23 * 3. Neither the names of the above-listed copyright holders nor the names 24 * of any contributors may be used to endorse or promote products derived 25 * from this software without specific prior written permission. 26 * 27 * Alternatively, this software may be distributed under the terms of the 28 * GNU General Public License ("GPL") version 2 as published by the Free 29 * Software Foundation. 30 * 31 * NO WARRANTY 32 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 33 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 34 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR 35 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 36 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 37 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 38 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 39 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 40 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 41 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 42 * POSSIBILITY OF SUCH DAMAGES. 43 */ 44 45 #include <acpi/acpi.h> 46 #include "accommon.h" 47 #include "acnamesp.h" 48 #include "acevents.h" 49 50 #define _COMPONENT ACPI_EVENTS 51 ACPI_MODULE_NAME("evxfregn") 52 53 /******************************************************************************* 54 * 55 * FUNCTION: acpi_install_address_space_handler 56 * 57 * PARAMETERS: Device - Handle for the device 58 * space_id - The address space ID 59 * Handler - Address of the handler 60 * Setup - Address of the setup function 61 * Context - Value passed to the handler on each access 62 * 63 * RETURN: Status 64 * 65 * DESCRIPTION: Install a handler for all op_regions of a given space_id. 66 * 67 * NOTE: This function should only be called after acpi_enable_subsystem has 68 * been called. This is because any _REG methods associated with the Space ID 69 * are executed here, and these methods can only be safely executed after 70 * the default handlers have been installed and the hardware has been 71 * initialized (via acpi_enable_subsystem.) 72 * 73 ******************************************************************************/ 74 acpi_status 75 acpi_install_address_space_handler(acpi_handle device, 76 acpi_adr_space_type space_id, 77 acpi_adr_space_handler handler, 78 acpi_adr_space_setup setup, void *context) 79 { 80 struct acpi_namespace_node *node; 81 acpi_status status; 82 83 ACPI_FUNCTION_TRACE(acpi_install_address_space_handler); 84 85 /* Parameter validation */ 86 87 if (!device) { 88 return_ACPI_STATUS(AE_BAD_PARAMETER); 89 } 90 91 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); 92 if (ACPI_FAILURE(status)) { 93 return_ACPI_STATUS(status); 94 } 95 96 /* Convert and validate the device handle */ 97 98 node = acpi_ns_validate_handle(device); 99 if (!node) { 100 status = AE_BAD_PARAMETER; 101 goto unlock_and_exit; 102 } 103 104 /* Install the handler for all Regions for this Space ID */ 105 106 status = 107 acpi_ev_install_space_handler(node, space_id, handler, setup, 108 context); 109 if (ACPI_FAILURE(status)) { 110 goto unlock_and_exit; 111 } 112 113 /* 114 * For the default space_iDs, (the IDs for which there are default region handlers 115 * installed) Only execute the _REG methods if the global initialization _REG 116 * methods have already been run (via acpi_initialize_objects). In other words, 117 * we will defer the execution of the _REG methods for these space_iDs until 118 * execution of acpi_initialize_objects. This is done because we need the handlers 119 * for the default spaces (mem/io/pci/table) to be installed before we can run 120 * any control methods (or _REG methods). There is known BIOS code that depends 121 * on this. 122 * 123 * For all other space_iDs, we can safely execute the _REG methods immediately. 124 * This means that for IDs like embedded_controller, this function should be called 125 * only after acpi_enable_subsystem has been called. 126 */ 127 switch (space_id) { 128 case ACPI_ADR_SPACE_SYSTEM_MEMORY: 129 case ACPI_ADR_SPACE_SYSTEM_IO: 130 case ACPI_ADR_SPACE_PCI_CONFIG: 131 case ACPI_ADR_SPACE_DATA_TABLE: 132 133 if (!acpi_gbl_reg_methods_executed) { 134 135 /* We will defer execution of the _REG methods for this space */ 136 goto unlock_and_exit; 137 } 138 break; 139 140 default: 141 break; 142 } 143 144 /* Run all _REG methods for this address space */ 145 146 status = acpi_ev_execute_reg_methods(node, space_id); 147 148 unlock_and_exit: 149 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); 150 return_ACPI_STATUS(status); 151 } 152 153 ACPI_EXPORT_SYMBOL(acpi_install_address_space_handler) 154 155 /******************************************************************************* 156 * 157 * FUNCTION: acpi_remove_address_space_handler 158 * 159 * PARAMETERS: Device - Handle for the device 160 * space_id - The address space ID 161 * Handler - Address of the handler 162 * 163 * RETURN: Status 164 * 165 * DESCRIPTION: Remove a previously installed handler. 166 * 167 ******************************************************************************/ 168 acpi_status 169 acpi_remove_address_space_handler(acpi_handle device, 170 acpi_adr_space_type space_id, 171 acpi_adr_space_handler handler) 172 { 173 union acpi_operand_object *obj_desc; 174 union acpi_operand_object *handler_obj; 175 union acpi_operand_object *region_obj; 176 union acpi_operand_object **last_obj_ptr; 177 struct acpi_namespace_node *node; 178 acpi_status status; 179 180 ACPI_FUNCTION_TRACE(acpi_remove_address_space_handler); 181 182 /* Parameter validation */ 183 184 if (!device) { 185 return_ACPI_STATUS(AE_BAD_PARAMETER); 186 } 187 188 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); 189 if (ACPI_FAILURE(status)) { 190 return_ACPI_STATUS(status); 191 } 192 193 /* Convert and validate the device handle */ 194 195 node = acpi_ns_validate_handle(device); 196 if (!node || 197 ((node->type != ACPI_TYPE_DEVICE) && 198 (node->type != ACPI_TYPE_PROCESSOR) && 199 (node->type != ACPI_TYPE_THERMAL) && 200 (node != acpi_gbl_root_node))) { 201 status = AE_BAD_PARAMETER; 202 goto unlock_and_exit; 203 } 204 205 /* Make sure the internal object exists */ 206 207 obj_desc = acpi_ns_get_attached_object(node); 208 if (!obj_desc) { 209 status = AE_NOT_EXIST; 210 goto unlock_and_exit; 211 } 212 213 /* Find the address handler the user requested */ 214 215 handler_obj = obj_desc->device.handler; 216 last_obj_ptr = &obj_desc->device.handler; 217 while (handler_obj) { 218 219 /* We have a handler, see if user requested this one */ 220 221 if (handler_obj->address_space.space_id == space_id) { 222 223 /* Handler must be the same as the installed handler */ 224 225 if (handler_obj->address_space.handler != handler) { 226 status = AE_BAD_PARAMETER; 227 goto unlock_and_exit; 228 } 229 230 /* Matched space_id, first dereference this in the Regions */ 231 232 ACPI_DEBUG_PRINT((ACPI_DB_OPREGION, 233 "Removing address handler %p(%p) for region %s " 234 "on Device %p(%p)\n", 235 handler_obj, handler, 236 acpi_ut_get_region_name(space_id), 237 node, obj_desc)); 238 239 region_obj = handler_obj->address_space.region_list; 240 241 /* Walk the handler's region list */ 242 243 while (region_obj) { 244 /* 245 * First disassociate the handler from the region. 246 * 247 * NOTE: this doesn't mean that the region goes away 248 * The region is just inaccessible as indicated to 249 * the _REG method 250 */ 251 acpi_ev_detach_region(region_obj, TRUE); 252 253 /* 254 * Walk the list: Just grab the head because the 255 * detach_region removed the previous head. 256 */ 257 region_obj = 258 handler_obj->address_space.region_list; 259 260 } 261 262 /* Remove this Handler object from the list */ 263 264 *last_obj_ptr = handler_obj->address_space.next; 265 266 /* Now we can delete the handler object */ 267 268 acpi_ut_remove_reference(handler_obj); 269 goto unlock_and_exit; 270 } 271 272 /* Walk the linked list of handlers */ 273 274 last_obj_ptr = &handler_obj->address_space.next; 275 handler_obj = handler_obj->address_space.next; 276 } 277 278 /* The handler does not exist */ 279 280 ACPI_DEBUG_PRINT((ACPI_DB_OPREGION, 281 "Unable to remove address handler %p for %s(%X), DevNode %p, obj %p\n", 282 handler, acpi_ut_get_region_name(space_id), space_id, 283 node, obj_desc)); 284 285 status = AE_NOT_EXIST; 286 287 unlock_and_exit: 288 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); 289 return_ACPI_STATUS(status); 290 } 291 292 ACPI_EXPORT_SYMBOL(acpi_remove_address_space_handler) 293