drivers/bus/acpi/acpica/events/evgpeinit.c

   1 /******************************************************************************
   2  *
   3  * Module Name: evgpeinit - System GPE initialization and update
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2019, 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    ("evgpeinit")
  51
  52 #if (!ACPI_REDUCED_HARDWARE) /* Entire module */
  53
  54 /*
  55  * Note: History of _PRW support in ACPICA
  56  *
  57  * Originally (2000 - 2010), the GPE initialization code performed a walk of
  58  * the entire namespace to execute the _PRW methods and detect all GPEs
  59  * capable of waking the system.
  60  *
  61  * As of 10/2010, the _PRW method execution has been removed since it is
  62  * actually unnecessary. The host OS must in fact execute all _PRW methods
  63  * in order to identify the device/power-resource dependencies. We now put
  64  * the onus on the host OS to identify the wake GPEs as part of this process
  65  * and to inform ACPICA of these GPEs via the AcpiSetupGpeForWake interface. This
  66  * not only reduces the complexity of the ACPICA initialization code, but in
  67  * some cases (on systems with very large namespaces) it should reduce the
  68  * kernel boot time as well.
  69  */
  70
  71 /*******************************************************************************
  72  *
  73  * FUNCTION:    AcpiEvGpeInitialize
  74  *
  75  * PARAMETERS:  None
  76  *
  77  * RETURN:      Status
  78  *
  79  * DESCRIPTION: Initialize the GPE data structures and the FADT GPE 0/1 blocks
  80  *
  81  ******************************************************************************/
  82
  83 ACPI_STATUS
  84 AcpiEvGpeInitialize (
  85     void)
  86 {
  87     UINT32                  RegisterCount0 = 0;
  88     UINT32                  RegisterCount1 = 0;
  89     UINT32                  GpeNumberMax = 0;
  90     ACPI_STATUS             Status;
  91
  92
  93     ACPI_FUNCTION_TRACE (EvGpeInitialize);
  94
  95
  96     ACPI_DEBUG_PRINT_RAW ((ACPI_DB_INIT,
  97         "Initializing General Purpose Events (GPEs):\n"));
  98
  99     Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE);
 100     if (ACPI_FAILURE (Status))
 101     {
 102         return_ACPI_STATUS (Status);
 103     }
 104
 105     /*
 106      * Initialize the GPE Block(s) defined in the FADT
 107      *
 108      * Why the GPE register block lengths are divided by 2:  From the ACPI
 109      * Spec, section "General-Purpose Event Registers", we have:
 110      *
 111      * "Each register block contains two registers of equal length
 112      *  GPEx_STS and GPEx_EN (where x is 0 or 1). The length of the
 113      *  GPE0_STS and GPE0_EN registers is equal to half the GPE0_LEN
 114      *  The length of the GPE1_STS and GPE1_EN registers is equal to
 115      *  half the GPE1_LEN. If a generic register block is not supported
 116      *  then its respective block pointer and block length values in the
 117      *  FADT table contain zeros. The GPE0_LEN and GPE1_LEN do not need
 118      *  to be the same size."
 119      */
 120
 121     /*
 122      * Determine the maximum GPE number for this machine.
 123      *
 124      * Note: both GPE0 and GPE1 are optional, and either can exist without
 125      * the other.
 126      *
 127      * If EITHER the register length OR the block address are zero, then that
 128      * particular block is not supported.
 129      */
 130     if (AcpiGbl_FADT.Gpe0BlockLength &&
 131         AcpiGbl_FADT.XGpe0Block.Address)
 132     {
 133         /* GPE block 0 exists (has both length and address > 0) */
 134
 135         RegisterCount0 = (UINT16) (AcpiGbl_FADT.Gpe0BlockLength / 2);
 136         GpeNumberMax = (RegisterCount0 * ACPI_GPE_REGISTER_WIDTH) - 1;
 137
 138         /* Install GPE Block 0 */
 139
 140         Status = AcpiEvCreateGpeBlock (AcpiGbl_FadtGpeDevice,
 141             AcpiGbl_FADT.XGpe0Block.Address,
 142             AcpiGbl_FADT.XGpe0Block.SpaceId,
 143             RegisterCount0, 0,
 144             AcpiGbl_FADT.SciInterrupt, &AcpiGbl_GpeFadtBlocks[0]);
 145
 146         if (ACPI_FAILURE (Status))
 147         {
 148             ACPI_EXCEPTION ((AE_INFO, Status,
 149                 "Could not create GPE Block 0"));
 150         }
 151     }
 152
 153     if (AcpiGbl_FADT.Gpe1BlockLength &&
 154         AcpiGbl_FADT.XGpe1Block.Address)
 155     {
 156         /* GPE block 1 exists (has both length and address > 0) */
 157
 158         RegisterCount1 = (UINT16) (AcpiGbl_FADT.Gpe1BlockLength / 2);
 159
 160         /* Check for GPE0/GPE1 overlap (if both banks exist) */
 161
 162         if ((RegisterCount0) &&
 163             (GpeNumberMax >= AcpiGbl_FADT.Gpe1Base))
 164         {
 165             ACPI_ERROR ((AE_INFO,
 166                 "GPE0 block (GPE 0 to %u) overlaps the GPE1 block "
 167                 "(GPE %u to %u) - Ignoring GPE1",
 168                 GpeNumberMax, AcpiGbl_FADT.Gpe1Base,
 169                 AcpiGbl_FADT.Gpe1Base +
 170                 ((RegisterCount1 * ACPI_GPE_REGISTER_WIDTH) - 1)));
 171
 172             /* Ignore GPE1 block by setting the register count to zero */
 173
 174             RegisterCount1 = 0;
 175         }
 176         else
 177         {
 178             /* Install GPE Block 1 */
 179
 180             Status = AcpiEvCreateGpeBlock (AcpiGbl_FadtGpeDevice,
 181                 AcpiGbl_FADT.XGpe1Block.Address,
 182                 AcpiGbl_FADT.XGpe1Block.SpaceId,
 183                 RegisterCount1,
 184                 AcpiGbl_FADT.Gpe1Base,
 185                 AcpiGbl_FADT.SciInterrupt, &AcpiGbl_GpeFadtBlocks[1]);
 186
 187             if (ACPI_FAILURE (Status))
 188             {
 189                 ACPI_EXCEPTION ((AE_INFO, Status,
 190                     "Could not create GPE Block 1"));
 191             }
 192
 193             /*
 194              * GPE0 and GPE1 do not have to be contiguous in the GPE number
 195              * space. However, GPE0 always starts at GPE number zero.
 196              */
 197         }
 198     }
 199
 200     /* Exit if there are no GPE registers */
 201
 202     if ((RegisterCount0 + RegisterCount1) == 0)
 203     {
 204         /* GPEs are not required by ACPI, this is OK */
 205
 206         ACPI_DEBUG_PRINT ((ACPI_DB_INIT,
 207             "There are no GPE blocks defined in the FADT\n"));
 208         goto Cleanup;
 209     }
 210
 211
 212 Cleanup:
 213     (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE);
 214     return_ACPI_STATUS (AE_OK);
 215 }
 216
 217
 218 /*******************************************************************************
 219  *
 220  * FUNCTION:    AcpiEvUpdateGpes
 221  *
 222  * PARAMETERS:  TableOwnerId        - ID of the newly-loaded ACPI table
 223  *
 224  * RETURN:      None
 225  *
 226  * DESCRIPTION: Check for new GPE methods (_Lxx/_Exx) made available as a
 227  *              result of a Load() or LoadTable() operation. If new GPE
 228  *              methods have been installed, register the new methods.
 229  *
 230  ******************************************************************************/
 231
 232 void
 233 AcpiEvUpdateGpes (
 234     ACPI_OWNER_ID           TableOwnerId)
 235 {
 236     ACPI_GPE_XRUPT_INFO     *GpeXruptInfo;
 237     ACPI_GPE_BLOCK_INFO     *GpeBlock;
 238     ACPI_GPE_WALK_INFO      WalkInfo;
 239     ACPI_STATUS             Status = AE_OK;
 240
 241
 242     /*
 243      * Find any _Lxx/_Exx GPE methods that have just been loaded.
 244      *
 245      * Any GPEs that correspond to new _Lxx/_Exx methods are immediately
 246      * enabled.
 247      *
 248      * Examine the namespace underneath each GpeDevice within the
 249      * GpeBlock lists.
 250      */
 251     Status = AcpiUtAcquireMutex (ACPI_MTX_EVENTS);
 252     if (ACPI_FAILURE (Status))
 253     {
 254         return;
 255     }
 256
 257     WalkInfo.Count = 0;
 258     WalkInfo.OwnerId = TableOwnerId;
 259     WalkInfo.ExecuteByOwnerId = TRUE;
 260
 261     /* Walk the interrupt level descriptor list */
 262
 263     GpeXruptInfo = AcpiGbl_GpeXruptListHead;
 264     while (GpeXruptInfo)
 265     {
 266         /* Walk all Gpe Blocks attached to this interrupt level */
 267
 268         GpeBlock = GpeXruptInfo->GpeBlockListHead;
 269         while (GpeBlock)
 270         {
 271             WalkInfo.GpeBlock = GpeBlock;
 272             WalkInfo.GpeDevice = GpeBlock->Node;
 273
 274             Status = AcpiNsWalkNamespace (ACPI_TYPE_METHOD,
 275                 WalkInfo.GpeDevice, ACPI_UINT32_MAX,
 276                 ACPI_NS_WALK_NO_UNLOCK, AcpiEvMatchGpeMethod,
 277                 NULL, &WalkInfo, NULL);
 278             if (ACPI_FAILURE (Status))
 279             {
 280                 ACPI_EXCEPTION ((AE_INFO, Status,
 281                     "While decoding _Lxx/_Exx methods"));
 282             }
 283
 284             GpeBlock = GpeBlock->Next;
 285         }
 286
 287         GpeXruptInfo = GpeXruptInfo->Next;
 288     }
 289
 290     if (WalkInfo.Count)
 291     {
 292         ACPI_INFO (("Enabled %u new GPEs", WalkInfo.Count));
 293     }
 294
 295     (void) AcpiUtReleaseMutex (ACPI_MTX_EVENTS);
 296     return;
 297 }
 298
 299
 300 /*******************************************************************************
 301  *
 302  * FUNCTION:    AcpiEvMatchGpeMethod
 303  *
 304  * PARAMETERS:  Callback from WalkNamespace
 305  *
 306  * RETURN:      Status
 307  *
 308  * DESCRIPTION: Called from AcpiWalkNamespace. Expects each object to be a
 309  *              control method under the _GPE portion of the namespace.
 310  *              Extract the name and GPE type from the object, saving this
 311  *              information for quick lookup during GPE dispatch. Allows a
 312  *              per-OwnerId evaluation if ExecuteByOwnerId is TRUE in the
 313  *              WalkInfo parameter block.
 314  *
 315  *              The name of each GPE control method is of the form:
 316  *              "_Lxx" or "_Exx", where:
 317  *                  L      - means that the GPE is level triggered
 318  *                  E      - means that the GPE is edge triggered
 319  *                  xx     - is the GPE number [in HEX]
 320  *
 321  * If WalkInfo->ExecuteByOwnerId is TRUE, we only execute examine GPE methods
 322  * with that owner.
 323  *
 324  ******************************************************************************/
 325
 326 ACPI_STATUS
 327 AcpiEvMatchGpeMethod (
 328     ACPI_HANDLE             ObjHandle,
 329     UINT32                  Level,
 330     void                    *Context,
 331     void                    **ReturnValue)
 332 {
 333     ACPI_NAMESPACE_NODE     *MethodNode = ACPI_CAST_PTR (ACPI_NAMESPACE_NODE, ObjHandle);
 334     ACPI_GPE_WALK_INFO      *WalkInfo = ACPI_CAST_PTR (ACPI_GPE_WALK_INFO, Context);
 335     ACPI_GPE_EVENT_INFO     *GpeEventInfo;
 336     ACPI_STATUS             Status;
 337     UINT32                  GpeNumber;
 338     UINT8                   TempGpeNumber;
 339     char                    Name[ACPI_NAMESEG_SIZE + 1];
 340     UINT8                   Type;
 341
 342
 343     ACPI_FUNCTION_TRACE (EvMatchGpeMethod);
 344
 345
 346     /* Check if requested OwnerId matches this OwnerId */
 347
 348     if ((WalkInfo->ExecuteByOwnerId) &&
 349         (MethodNode->OwnerId != WalkInfo->OwnerId))
 350     {
 351         return_ACPI_STATUS (AE_OK);
 352     }
 353
 354     /*
 355      * Match and decode the _Lxx and _Exx GPE method names
 356      *
 357      * 1) Extract the method name and null terminate it
 358      */
 359     ACPI_MOVE_32_TO_32 (Name, &MethodNode->Name.Integer);
 360     Name[ACPI_NAMESEG_SIZE] = 0;
 361
 362     /* 2) Name must begin with an underscore */
 363
 364     if (Name[0] != '_')
 365     {
 366         return_ACPI_STATUS (AE_OK); /* Ignore this method */
 367     }
 368
 369     /*
 370      * 3) Edge/Level determination is based on the 2nd character
 371      *    of the method name
 372      */
 373     switch (Name[1])
 374     {
 375     case 'L':
 376
 377         Type = ACPI_GPE_LEVEL_TRIGGERED;
 378         break;
 379
 380     case 'E':
 381
 382         Type = ACPI_GPE_EDGE_TRIGGERED;
 383         break;
 384
 385     default:
 386
 387         /* Unknown method type, just ignore it */
 388
 389         ACPI_DEBUG_PRINT ((ACPI_DB_LOAD,
 390             "Ignoring unknown GPE method type: %s "
 391             "(name not of form _Lxx or _Exx)", Name));
 392         return_ACPI_STATUS (AE_OK);
 393     }
 394
 395     /* 4) The last two characters of the name are the hex GPE Number */
 396
 397     Status = AcpiUtAsciiToHexByte (&Name[2], &TempGpeNumber);
 398     if (ACPI_FAILURE (Status))
 399     {
 400         /* Conversion failed; invalid method, just ignore it */
 401
 402         ACPI_DEBUG_PRINT ((ACPI_DB_LOAD,
 403             "Could not extract GPE number from name: %s "
 404             "(name is not of form _Lxx or _Exx)", Name));
 405         return_ACPI_STATUS (AE_OK);
 406     }
 407
 408     /* Ensure that we have a valid GPE number for this GPE block */
 409
 410     GpeNumber = (UINT32) TempGpeNumber;
 411     GpeEventInfo = AcpiEvLowGetGpeInfo (GpeNumber, WalkInfo->GpeBlock);
 412     if (!GpeEventInfo)
 413     {
 414         /*
 415          * This GpeNumber is not valid for this GPE block, just ignore it.
 416          * However, it may be valid for a different GPE block, since GPE0
 417          * and GPE1 methods both appear under \_GPE.
 418          */
 419         return_ACPI_STATUS (AE_OK);
 420     }
 421
 422     if ((ACPI_GPE_DISPATCH_TYPE (GpeEventInfo->Flags) ==
 423             ACPI_GPE_DISPATCH_HANDLER) ||
 424         (ACPI_GPE_DISPATCH_TYPE (GpeEventInfo->Flags) ==
 425             ACPI_GPE_DISPATCH_RAW_HANDLER))
 426     {
 427         /* If there is already a handler, ignore this GPE method */
 428
 429         return_ACPI_STATUS (AE_OK);
 430     }
 431
 432     if (ACPI_GPE_DISPATCH_TYPE (GpeEventInfo->Flags) ==
 433         ACPI_GPE_DISPATCH_METHOD)
 434     {
 435         /*
 436          * If there is already a method, ignore this method. But check
 437          * for a type mismatch (if both the _Lxx AND _Exx exist)
 438          */
 439         if (Type != (GpeEventInfo->Flags & ACPI_GPE_XRUPT_TYPE_MASK))
 440         {
 441             ACPI_ERROR ((AE_INFO,
 442                 "For GPE 0x%.2X, found both _L%2.2X and _E%2.2X methods",
 443                 GpeNumber, GpeNumber, GpeNumber));
 444         }
 445         return_ACPI_STATUS (AE_OK);
 446     }
 447
 448     /* Disable the GPE in case it's been enabled already. */
 449
 450     (void) AcpiHwLowSetGpe (GpeEventInfo, ACPI_GPE_DISABLE);
 451
 452     /*
 453      * Add the GPE information from above to the GpeEventInfo block for
 454      * use during dispatch of this GPE.
 455      */
 456     GpeEventInfo->Flags &= ~(ACPI_GPE_DISPATCH_MASK);
 457     GpeEventInfo->Flags |= (UINT8) (Type | ACPI_GPE_DISPATCH_METHOD);
 458     GpeEventInfo->Dispatch.MethodNode = MethodNode;
 459
 460     ACPI_DEBUG_PRINT ((ACPI_DB_LOAD,
 461         "Registered GPE method %s as GPE number 0x%.2X\n",
 462         Name, GpeNumber));
 463     return_ACPI_STATUS (AE_OK);
 464 }
 465
 466 #endif /* !ACPI_REDUCED_HARDWARE */