drivers/acpi/acpica/evmisc.c

   1 /******************************************************************************
   2  *
   3  * Module Name: evmisc - Miscellaneous event manager support functions
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2017, Intel Corp.
   9  * All rights reserved.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions, and the following disclaimer,
  16  *    without modification.
  17  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  18  *    substantially similar to the "NO WARRANTY" disclaimer below
  19  *    ("Disclaimer") and any redistribution must be conditioned upon
  20  *    including a substantially similar Disclaimer requirement for further
  21  *    binary redistribution.
  22  * 3. Neither the names of the above-listed copyright holders nor the names
  23  *    of any contributors may be used to endorse or promote products derived
  24  *    from this software without specific prior written permission.
  25  *
  26  * Alternatively, this software may be distributed under the terms of the
  27  * GNU General Public License ("GPL") version 2 as published by the Free
  28  * Software Foundation.
  29  *
  30  * NO WARRANTY
  31  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  32  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  33  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  34  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  35  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  36  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  37  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  38  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  39  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  40  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  41  * POSSIBILITY OF SUCH DAMAGES.
  42  */
  43
  44 #include <acpi/acpi.h>
  45 #include "accommon.h"
  46 #include "acevents.h"
  47 #include "acnamesp.h"
  48
  49 #define _COMPONENT          ACPI_EVENTS
  50 ACPI_MODULE_NAME("evmisc")
  51
  52 /* Local prototypes */
  53 static void ACPI_SYSTEM_XFACE acpi_ev_notify_dispatch(void *context);
  54
  55 /*******************************************************************************
  56  *
  57  * FUNCTION:    acpi_ev_is_notify_object
  58  *
  59  * PARAMETERS:  node            - Node to check
  60  *
  61  * RETURN:      TRUE if notifies allowed on this object
  62  *
  63  * DESCRIPTION: Check type of node for a object that supports notifies.
  64  *
  65  *              TBD: This could be replaced by a flag bit in the node.
  66  *
  67  ******************************************************************************/
  68
  69 u8 acpi_ev_is_notify_object(struct acpi_namespace_node *node)
  70 {
  71
  72         switch (node->type) {
  73         case ACPI_TYPE_DEVICE:
  74         case ACPI_TYPE_PROCESSOR:
  75         case ACPI_TYPE_THERMAL:
  76                 /*
  77                  * These are the ONLY objects that can receive ACPI notifications
  78                  */
  79                 return (TRUE);
  80
  81         default:
  82
  83                 return (FALSE);
  84         }
  85 }
  86
  87 /*******************************************************************************
  88  *
  89  * FUNCTION:    acpi_ev_queue_notify_request
  90  *
  91  * PARAMETERS:  node            - NS node for the notified object
  92  *              notify_value    - Value from the Notify() request
  93  *
  94  * RETURN:      Status
  95  *
  96  * DESCRIPTION: Dispatch a device notification event to a previously
  97  *              installed handler.
  98  *
  99  ******************************************************************************/
 100
 101 acpi_status
 102 acpi_ev_queue_notify_request(struct acpi_namespace_node *node, u32 notify_value)
 103 {
 104         union acpi_operand_object *obj_desc;
 105         union acpi_operand_object *handler_list_head = NULL;
 106         union acpi_generic_state *info;
 107         u8 handler_list_id = 0;
 108         acpi_status status = AE_OK;
 109
 110         ACPI_FUNCTION_NAME(ev_queue_notify_request);
 111
 112         /* Are Notifies allowed on this object? */
 113
 114         if (!acpi_ev_is_notify_object(node)) {
 115                 return (AE_TYPE);
 116         }
 117
 118         /* Get the correct notify list type (System or Device) */
 119
 120         if (notify_value <= ACPI_MAX_SYS_NOTIFY) {
 121                 handler_list_id = ACPI_SYSTEM_HANDLER_LIST;
 122         } else {
 123                 handler_list_id = ACPI_DEVICE_HANDLER_LIST;
 124         }
 125
 126         /* Get the notify object attached to the namespace Node */
 127
 128         obj_desc = acpi_ns_get_attached_object(node);
 129         if (obj_desc) {
 130
 131                 /* We have an attached object, Get the correct handler list */
 132
 133                 handler_list_head =
 134                     obj_desc->common_notify.notify_list[handler_list_id];
 135         }
 136
 137         /*
 138          * If there is no notify handler (Global or Local)
 139          * for this object, just ignore the notify
 140          */
 141         if (!acpi_gbl_global_notify[handler_list_id].handler
 142             && !handler_list_head) {
 143                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 144                                   "No notify handler for Notify, ignoring (%4.4s, %X) node %p\n",
 145                                   acpi_ut_get_node_name(node), notify_value,
 146                                   node));
 147
 148                 return (AE_OK);
 149         }
 150
 151         /* Setup notify info and schedule the notify dispatcher */
 152
 153         info = acpi_ut_create_generic_state();
 154         if (!info) {
 155                 return (AE_NO_MEMORY);
 156         }
 157
 158         info->common.descriptor_type = ACPI_DESC_TYPE_STATE_NOTIFY;
 159
 160         info->notify.node = node;
 161         info->notify.value = (u16)notify_value;
 162         info->notify.handler_list_id = handler_list_id;
 163         info->notify.handler_list_head = handler_list_head;
 164         info->notify.global = &acpi_gbl_global_notify[handler_list_id];
 165
 166         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 167                           "Dispatching Notify on [%4.4s] (%s) Value 0x%2.2X (%s) Node %p\n",
 168                           acpi_ut_get_node_name(node),
 169                           acpi_ut_get_type_name(node->type), notify_value,
 170                           acpi_ut_get_notify_name(notify_value, ACPI_TYPE_ANY),
 171                           node));
 172
 173         status = acpi_os_execute(OSL_NOTIFY_HANDLER,
 174                                  acpi_ev_notify_dispatch, info);
 175         if (ACPI_FAILURE(status)) {
 176                 acpi_ut_delete_generic_state(info);
 177         }
 178
 179         return (status);
 180 }
 181
 182 /*******************************************************************************
 183  *
 184  * FUNCTION:    acpi_ev_notify_dispatch
 185  *
 186  * PARAMETERS:  context         - To be passed to the notify handler
 187  *
 188  * RETURN:      None.
 189  *
 190  * DESCRIPTION: Dispatch a device notification event to a previously
 191  *              installed handler.
 192  *
 193  ******************************************************************************/
 194
 195 static void ACPI_SYSTEM_XFACE acpi_ev_notify_dispatch(void *context)
 196 {
 197         union acpi_generic_state *info = (union acpi_generic_state *)context;
 198         union acpi_operand_object *handler_obj;
 199
 200         ACPI_FUNCTION_ENTRY();
 201
 202         /* Invoke a global notify handler if installed */
 203
 204         if (info->notify.global->handler) {
 205                 info->notify.global->handler(info->notify.node,
 206                                              info->notify.value,
 207                                              info->notify.global->context);
 208         }
 209
 210         /* Now invoke the local notify handler(s) if any are installed */
 211
 212         handler_obj = info->notify.handler_list_head;
 213         while (handler_obj) {
 214                 handler_obj->notify.handler(info->notify.node,
 215                                             info->notify.value,
 216                                             handler_obj->notify.context);
 217
 218                 handler_obj =
 219                     handler_obj->notify.next[info->notify.handler_list_id];
 220         }
 221
 222         /* All done with the info object */
 223
 224         acpi_ut_delete_generic_state(info);
 225 }
 226
 227 #if (!ACPI_REDUCED_HARDWARE)
 228 /******************************************************************************
 229  *
 230  * FUNCTION:    acpi_ev_terminate
 231  *
 232  * PARAMETERS:  none
 233  *
 234  * RETURN:      none
 235  *
 236  * DESCRIPTION: Disable events and free memory allocated for table storage.
 237  *
 238  ******************************************************************************/
 239
 240 void acpi_ev_terminate(void)
 241 {
 242         u32 i;
 243         acpi_status status;
 244
 245         ACPI_FUNCTION_TRACE(ev_terminate);
 246
 247         if (acpi_gbl_events_initialized) {
 248                 /*
 249                  * Disable all event-related functionality. In all cases, on error,
 250                  * print a message but obviously we don't abort.
 251                  */
 252
 253                 /* Disable all fixed events */
 254
 255                 for (i = 0; i < ACPI_NUM_FIXED_EVENTS; i++) {
 256                         status = acpi_disable_event(i, 0);
 257                         if (ACPI_FAILURE(status)) {
 258                                 ACPI_ERROR((AE_INFO,
 259                                             "Could not disable fixed event %u",
 260                                             (u32) i));
 261                         }
 262                 }
 263
 264                 /* Disable all GPEs in all GPE blocks */
 265
 266                 status = acpi_ev_walk_gpe_list(acpi_hw_disable_gpe_block, NULL);
 267
 268                 status = acpi_ev_remove_global_lock_handler();
 269                 if (ACPI_FAILURE(status)) {
 270                         ACPI_ERROR((AE_INFO,
 271                                     "Could not remove Global Lock handler"));
 272                 }
 273
 274                 acpi_gbl_events_initialized = FALSE;
 275         }
 276
 277         /* Remove SCI handlers */
 278
 279         status = acpi_ev_remove_all_sci_handlers();
 280         if (ACPI_FAILURE(status)) {
 281                 ACPI_ERROR((AE_INFO, "Could not remove SCI handler"));
 282         }
 283
 284         /* Deallocate all handler objects installed within GPE info structs */
 285
 286         status = acpi_ev_walk_gpe_list(acpi_ev_delete_gpe_handlers, NULL);
 287
 288         /* Return to original mode if necessary */
 289
 290         if (acpi_gbl_original_mode == ACPI_SYS_MODE_LEGACY) {
 291                 status = acpi_disable();
 292                 if (ACPI_FAILURE(status)) {
 293                         ACPI_WARNING((AE_INFO, "AcpiDisable failed"));
 294                 }
 295         }
 296         return_VOID;
 297 }
 298
 299 #endif                          /* !ACPI_REDUCED_HARDWARE */