drivers/bus/acpi/acpica/events/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.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
  53 /* Local prototypes */
  54
  55 static void ACPI_SYSTEM_XFACE
  56 AcpiEvNotifyDispatch (
  57     void                    *Context);
  58
  59
  60 /*******************************************************************************
  61  *
  62  * FUNCTION:    AcpiEvIsNotifyObject
  63  *
  64  * PARAMETERS:  Node            - Node to check
  65  *
  66  * RETURN:      TRUE if notifies allowed on this object
  67  *
  68  * DESCRIPTION: Check type of node for a object that supports notifies.
  69  *
  70  *              TBD: This could be replaced by a flag bit in the node.
  71  *
  72  ******************************************************************************/
  73
  74 BOOLEAN
  75 AcpiEvIsNotifyObject (
  76     ACPI_NAMESPACE_NODE     *Node)
  77 {
  78
  79     switch (Node->Type)
  80     {
  81     case ACPI_TYPE_DEVICE:
  82     case ACPI_TYPE_PROCESSOR:
  83     case ACPI_TYPE_THERMAL:
  84         /*
  85          * These are the ONLY objects that can receive ACPI notifications
  86          */
  87         return (TRUE);
  88
  89     default:
  90
  91         return (FALSE);
  92     }
  93 }
  94
  95
  96 /*******************************************************************************
  97  *
  98  * FUNCTION:    AcpiEvQueueNotifyRequest
  99  *
 100  * PARAMETERS:  Node            - NS node for the notified object
 101  *              NotifyValue     - Value from the Notify() request
 102  *
 103  * RETURN:      Status
 104  *
 105  * DESCRIPTION: Dispatch a device notification event to a previously
 106  *              installed handler.
 107  *
 108  ******************************************************************************/
 109
 110 ACPI_STATUS
 111 AcpiEvQueueNotifyRequest (
 112     ACPI_NAMESPACE_NODE     *Node,
 113     UINT32                  NotifyValue)
 114 {
 115     ACPI_OPERAND_OBJECT     *ObjDesc;
 116     ACPI_OPERAND_OBJECT     *HandlerListHead = NULL;
 117     ACPI_GENERIC_STATE      *Info;
 118     UINT8                   HandlerListId = 0;
 119     ACPI_STATUS             Status = AE_OK;
 120
 121
 122     ACPI_FUNCTION_NAME (EvQueueNotifyRequest);
 123
 124
 125     /* Are Notifies allowed on this object? */
 126
 127     if (!AcpiEvIsNotifyObject (Node))
 128     {
 129         return (AE_TYPE);
 130     }
 131
 132     /* Get the correct notify list type (System or Device) */
 133
 134     if (NotifyValue <= ACPI_MAX_SYS_NOTIFY)
 135     {
 136         HandlerListId = ACPI_SYSTEM_HANDLER_LIST;
 137     }
 138     else
 139     {
 140         HandlerListId = ACPI_DEVICE_HANDLER_LIST;
 141     }
 142
 143     /* Get the notify object attached to the namespace Node */
 144
 145     ObjDesc = AcpiNsGetAttachedObject (Node);
 146     if (ObjDesc)
 147     {
 148         /* We have an attached object, Get the correct handler list */
 149
 150         HandlerListHead = ObjDesc->CommonNotify.NotifyList[HandlerListId];
 151     }
 152
 153     /*
 154      * If there is no notify handler (Global or Local)
 155      * for this object, just ignore the notify
 156      */
 157     if (!AcpiGbl_GlobalNotify[HandlerListId].Handler && !HandlerListHead)
 158     {
 159         ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
 160             "No notify handler for Notify, ignoring (%4.4s, %X) node %p\n",
 161             AcpiUtGetNodeName (Node), NotifyValue, Node));
 162
 163         return (AE_OK);
 164     }
 165
 166     /* Setup notify info and schedule the notify dispatcher */
 167
 168     Info = AcpiUtCreateGenericState ();
 169     if (!Info)
 170     {
 171         return (AE_NO_MEMORY);
 172     }
 173
 174     Info->Common.DescriptorType = ACPI_DESC_TYPE_STATE_NOTIFY;
 175
 176     Info->Notify.Node = Node;
 177     Info->Notify.Value = (UINT16) NotifyValue;
 178     Info->Notify.HandlerListId = HandlerListId;
 179     Info->Notify.HandlerListHead = HandlerListHead;
 180     Info->Notify.Global = &AcpiGbl_GlobalNotify[HandlerListId];
 181
 182     ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
 183         "Dispatching Notify on [%4.4s] (%s) Value 0x%2.2X (%s) Node %p\n",
 184         AcpiUtGetNodeName (Node), AcpiUtGetTypeName (Node->Type),
 185         NotifyValue, AcpiUtGetNotifyName (NotifyValue, ACPI_TYPE_ANY), Node));
 186
 187     Status = AcpiOsExecute (OSL_NOTIFY_HANDLER,
 188         AcpiEvNotifyDispatch, Info);
 189     if (ACPI_FAILURE (Status))
 190     {
 191         AcpiUtDeleteGenericState (Info);
 192     }
 193
 194     return (Status);
 195 }
 196
 197
 198 /*******************************************************************************
 199  *
 200  * FUNCTION:    AcpiEvNotifyDispatch
 201  *
 202  * PARAMETERS:  Context         - To be passed to the notify handler
 203  *
 204  * RETURN:      None.
 205  *
 206  * DESCRIPTION: Dispatch a device notification event to a previously
 207  *              installed handler.
 208  *
 209  ******************************************************************************/
 210
 211 static void ACPI_SYSTEM_XFACE
 212 AcpiEvNotifyDispatch (
 213     void                    *Context)
 214 {
 215     ACPI_GENERIC_STATE      *Info = (ACPI_GENERIC_STATE *) Context;
 216     ACPI_OPERAND_OBJECT     *HandlerObj;
 217
 218
 219     ACPI_FUNCTION_ENTRY ();
 220
 221
 222     /* Invoke a global notify handler if installed */
 223
 224     if (Info->Notify.Global->Handler)
 225     {
 226         Info->Notify.Global->Handler (Info->Notify.Node,
 227             Info->Notify.Value,
 228             Info->Notify.Global->Context);
 229     }
 230
 231     /* Now invoke the local notify handler(s) if any are installed */
 232
 233     HandlerObj = Info->Notify.HandlerListHead;
 234     while (HandlerObj)
 235     {
 236         HandlerObj->Notify.Handler (Info->Notify.Node,
 237             Info->Notify.Value,
 238             HandlerObj->Notify.Context);
 239
 240         HandlerObj = HandlerObj->Notify.Next[Info->Notify.HandlerListId];
 241     }
 242
 243     /* All done with the info object */
 244
 245     AcpiUtDeleteGenericState (Info);
 246 }
 247
 248
 249 #if (!ACPI_REDUCED_HARDWARE)
 250 /******************************************************************************
 251  *
 252  * FUNCTION:    AcpiEvTerminate
 253  *
 254  * PARAMETERS:  none
 255  *
 256  * RETURN:      none
 257  *
 258  * DESCRIPTION: Disable events and free memory allocated for table storage.
 259  *
 260  ******************************************************************************/
 261
 262 void
 263 AcpiEvTerminate (
 264     void)
 265 {
 266     UINT32                  i;
 267     ACPI_STATUS             Status;
 268
 269
 270     ACPI_FUNCTION_TRACE (EvTerminate);
 271
 272
 273     if (AcpiGbl_EventsInitialized)
 274     {
 275         /*
 276          * Disable all event-related functionality. In all cases, on error,
 277          * print a message but obviously we don't abort.
 278          */
 279
 280         /* Disable all fixed events */
 281
 282         for (i = 0; i < ACPI_NUM_FIXED_EVENTS; i++)
 283         {
 284             Status = AcpiDisableEvent (i, 0);
 285             if (ACPI_FAILURE (Status))
 286             {
 287                 ACPI_ERROR ((AE_INFO,
 288                     "Could not disable fixed event %u", (UINT32) i));
 289             }
 290         }
 291
 292         /* Disable all GPEs in all GPE blocks */
 293
 294         Status = AcpiEvWalkGpeList (AcpiHwDisableGpeBlock, NULL);
 295
 296         Status = AcpiEvRemoveGlobalLockHandler ();
 297         if (ACPI_FAILURE(Status))
 298         {
 299             ACPI_ERROR ((AE_INFO,
 300                 "Could not remove Global Lock handler"));
 301         }
 302
 303         AcpiGbl_EventsInitialized = FALSE;
 304     }
 305
 306     /* Remove SCI handlers */
 307
 308     Status = AcpiEvRemoveAllSciHandlers ();
 309     if (ACPI_FAILURE(Status))
 310     {
 311         ACPI_ERROR ((AE_INFO,
 312             "Could not remove SCI handler"));
 313     }
 314
 315     /* Deallocate all handler objects installed within GPE info structs */
 316
 317     Status = AcpiEvWalkGpeList (AcpiEvDeleteGpeHandlers, NULL);
 318
 319     /* Return to original mode if necessary */
 320
 321     if (AcpiGbl_OriginalMode == ACPI_SYS_MODE_LEGACY)
 322     {
 323         Status = AcpiDisable ();
 324         if (ACPI_FAILURE (Status))
 325         {
 326             ACPI_WARNING ((AE_INFO, "AcpiDisable failed"));
 327         }
 328     }
 329     return_VOID;
 330 }
 331
 332 #endif /* !ACPI_REDUCED_HARDWARE */