drivers/acpi/acpica/evxfregn.c

   1 /******************************************************************************
   2  *
   3  * Module Name: evxfregn - External Interfaces, ACPI Operation Regions and
   4  *                         Address Spaces.
   5  *
   6  *****************************************************************************/
   7
   8 /*
   9  * Copyright (C) 2000 - 2015, 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 #define EXPORT_ACPI_INTERFACES
  46
  47 #include <acpi/acpi.h>
  48 #include "accommon.h"
  49 #include "acnamesp.h"
  50 #include "acevents.h"
  51
  52 #define _COMPONENT          ACPI_EVENTS
  53 ACPI_MODULE_NAME("evxfregn")
  54
  55 /*******************************************************************************
  56  *
  57  * FUNCTION:    acpi_install_address_space_handler
  58  *
  59  * PARAMETERS:  device          - Handle for the device
  60  *              space_id        - The address space ID
  61  *              handler         - Address of the handler
  62  *              setup           - Address of the setup function
  63  *              context         - Value passed to the handler on each access
  64  *
  65  * RETURN:      Status
  66  *
  67  * DESCRIPTION: Install a handler for all op_regions of a given space_id.
  68  *
  69  * NOTE: This function should only be called after acpi_enable_subsystem has
  70  * been called. This is because any _REG methods associated with the Space ID
  71  * are executed here, and these methods can only be safely executed after
  72  * the default handlers have been installed and the hardware has been
  73  * initialized (via acpi_enable_subsystem.)
  74  *
  75  ******************************************************************************/
  76 acpi_status
  77 acpi_install_address_space_handler(acpi_handle device,
  78                                    acpi_adr_space_type space_id,
  79                                    acpi_adr_space_handler handler,
  80                                    acpi_adr_space_setup setup, void *context)
  81 {
  82         struct acpi_namespace_node *node;
  83         acpi_status status;
  84
  85         ACPI_FUNCTION_TRACE(acpi_install_address_space_handler);
  86
  87         /* Parameter validation */
  88
  89         if (!device) {
  90                 return_ACPI_STATUS(AE_BAD_PARAMETER);
  91         }
  92
  93         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
  94         if (ACPI_FAILURE(status)) {
  95                 return_ACPI_STATUS(status);
  96         }
  97
  98         /* Convert and validate the device handle */
  99
 100         node = acpi_ns_validate_handle(device);
 101         if (!node) {
 102                 status = AE_BAD_PARAMETER;
 103                 goto unlock_and_exit;
 104         }
 105
 106         /* Install the handler for all Regions for this Space ID */
 107
 108         status =
 109             acpi_ev_install_space_handler(node, space_id, handler, setup,
 110                                           context);
 111         if (ACPI_FAILURE(status)) {
 112                 goto unlock_and_exit;
 113         }
 114
 115         /*
 116          * For the default space_IDs, (the IDs for which there are default region handlers
 117          * installed) Only execute the _REG methods if the global initialization _REG
 118          * methods have already been run (via acpi_initialize_objects). In other words,
 119          * we will defer the execution of the _REG methods for these space_IDs until
 120          * execution of acpi_initialize_objects. This is done because we need the handlers
 121          * for the default spaces (mem/io/pci/table) to be installed before we can run
 122          * any control methods (or _REG methods). There is known BIOS code that depends
 123          * on this.
 124          *
 125          * For all other space_IDs, we can safely execute the _REG methods immediately.
 126          * This means that for IDs like embedded_controller, this function should be called
 127          * only after acpi_enable_subsystem has been called.
 128          */
 129         switch (space_id) {
 130         case ACPI_ADR_SPACE_SYSTEM_MEMORY:
 131         case ACPI_ADR_SPACE_SYSTEM_IO:
 132         case ACPI_ADR_SPACE_PCI_CONFIG:
 133         case ACPI_ADR_SPACE_DATA_TABLE:
 134
 135                 if (!acpi_gbl_reg_methods_executed) {
 136
 137                         /* We will defer execution of the _REG methods for this space */
 138
 139                         goto unlock_and_exit;
 140                 }
 141                 break;
 142
 143         default:
 144
 145                 break;
 146         }
 147
 148         /* Run all _REG methods for this address space */
 149
 150         status = acpi_ev_execute_reg_methods(node, space_id);
 151
 152 unlock_and_exit:
 153         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 154         return_ACPI_STATUS(status);
 155 }
 156
 157 ACPI_EXPORT_SYMBOL(acpi_install_address_space_handler)
 158
 159 /*******************************************************************************
 160  *
 161  * FUNCTION:    acpi_remove_address_space_handler
 162  *
 163  * PARAMETERS:  device          - Handle for the device
 164  *              space_id        - The address space ID
 165  *              handler         - Address of the handler
 166  *
 167  * RETURN:      Status
 168  *
 169  * DESCRIPTION: Remove a previously installed handler.
 170  *
 171  ******************************************************************************/
 172 acpi_status
 173 acpi_remove_address_space_handler(acpi_handle device,
 174                                   acpi_adr_space_type space_id,
 175                                   acpi_adr_space_handler handler)
 176 {
 177         union acpi_operand_object *obj_desc;
 178         union acpi_operand_object *handler_obj;
 179         union acpi_operand_object *region_obj;
 180         union acpi_operand_object **last_obj_ptr;
 181         struct acpi_namespace_node *node;
 182         acpi_status status;
 183
 184         ACPI_FUNCTION_TRACE(acpi_remove_address_space_handler);
 185
 186         /* Parameter validation */
 187
 188         if (!device) {
 189                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 190         }
 191
 192         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 193         if (ACPI_FAILURE(status)) {
 194                 return_ACPI_STATUS(status);
 195         }
 196
 197         /* Convert and validate the device handle */
 198
 199         node = acpi_ns_validate_handle(device);
 200         if (!node ||
 201             ((node->type != ACPI_TYPE_DEVICE) &&
 202              (node->type != ACPI_TYPE_PROCESSOR) &&
 203              (node->type != ACPI_TYPE_THERMAL) &&
 204              (node != acpi_gbl_root_node))) {
 205                 status = AE_BAD_PARAMETER;
 206                 goto unlock_and_exit;
 207         }
 208
 209         /* Make sure the internal object exists */
 210
 211         obj_desc = acpi_ns_get_attached_object(node);
 212         if (!obj_desc) {
 213                 status = AE_NOT_EXIST;
 214                 goto unlock_and_exit;
 215         }
 216
 217         /* Find the address handler the user requested */
 218
 219         handler_obj = obj_desc->device.handler;
 220         last_obj_ptr = &obj_desc->device.handler;
 221         while (handler_obj) {
 222
 223                 /* We have a handler, see if user requested this one */
 224
 225                 if (handler_obj->address_space.space_id == space_id) {
 226
 227                         /* Handler must be the same as the installed handler */
 228
 229                         if (handler_obj->address_space.handler != handler) {
 230                                 status = AE_BAD_PARAMETER;
 231                                 goto unlock_and_exit;
 232                         }
 233
 234                         /* Matched space_id, first dereference this in the Regions */
 235
 236                         ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
 237                                           "Removing address handler %p(%p) for region %s "
 238                                           "on Device %p(%p)\n",
 239                                           handler_obj, handler,
 240                                           acpi_ut_get_region_name(space_id),
 241                                           node, obj_desc));
 242
 243                         region_obj = handler_obj->address_space.region_list;
 244
 245                         /* Walk the handler's region list */
 246
 247                         while (region_obj) {
 248                                 /*
 249                                  * First disassociate the handler from the region.
 250                                  *
 251                                  * NOTE: this doesn't mean that the region goes away
 252                                  * The region is just inaccessible as indicated to
 253                                  * the _REG method
 254                                  */
 255                                 acpi_ev_detach_region(region_obj, TRUE);
 256
 257                                 /*
 258                                  * Walk the list: Just grab the head because the
 259                                  * detach_region removed the previous head.
 260                                  */
 261                                 region_obj =
 262                                     handler_obj->address_space.region_list;
 263
 264                         }
 265
 266                         /* Remove this Handler object from the list */
 267
 268                         *last_obj_ptr = handler_obj->address_space.next;
 269
 270                         /* Now we can delete the handler object */
 271
 272                         acpi_ut_remove_reference(handler_obj);
 273                         goto unlock_and_exit;
 274                 }
 275
 276                 /* Walk the linked list of handlers */
 277
 278                 last_obj_ptr = &handler_obj->address_space.next;
 279                 handler_obj = handler_obj->address_space.next;
 280         }
 281
 282         /* The handler does not exist */
 283
 284         ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
 285                           "Unable to remove address handler %p for %s(%X), DevNode %p, obj %p\n",
 286                           handler, acpi_ut_get_region_name(space_id), space_id,
 287                           node, obj_desc));
 288
 289         status = AE_NOT_EXIST;
 290
 291 unlock_and_exit:
 292         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 293         return_ACPI_STATUS(status);
 294 }
 295
 296 ACPI_EXPORT_SYMBOL(acpi_remove_address_space_handler)