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tbxfload.c revision 1.1.1.2
      1 /******************************************************************************
      2  *
      3  * Module Name: tbxfload - Table load/unload external interfaces
      4  *
      5  *****************************************************************************/
      6 
      7 /*
      8  * Copyright (C) 2000 - 2014, 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 #define __TBXFLOAD_C__
     45 #define EXPORT_ACPI_INTERFACES
     46 
     47 #include "acpi.h"
     48 #include "accommon.h"
     49 #include "acnamesp.h"
     50 #include "actables.h"
     51 
     52 #define _COMPONENT          ACPI_TABLES
     53         ACPI_MODULE_NAME    ("tbxfload")
     54 
     55 /* Local prototypes */
     56 
     57 static ACPI_STATUS
     58 AcpiTbLoadNamespace (
     59     void);
     60 
     61 
     62 /*******************************************************************************
     63  *
     64  * FUNCTION:    AcpiLoadTables
     65  *
     66  * PARAMETERS:  None
     67  *
     68  * RETURN:      Status
     69  *
     70  * DESCRIPTION: Load the ACPI tables from the RSDT/XSDT
     71  *
     72  ******************************************************************************/
     73 
     74 ACPI_STATUS
     75 AcpiLoadTables (
     76     void)
     77 {
     78     ACPI_STATUS             Status;
     79 
     80 
     81     ACPI_FUNCTION_TRACE (AcpiLoadTables);
     82 
     83 
     84     /* Load the namespace from the tables */
     85 
     86     Status = AcpiTbLoadNamespace ();
     87     if (ACPI_FAILURE (Status))
     88     {
     89         ACPI_EXCEPTION ((AE_INFO, Status,
     90             "While loading namespace from ACPI tables"));
     91     }
     92 
     93     return_ACPI_STATUS (Status);
     94 }
     95 
     96 ACPI_EXPORT_SYMBOL_INIT (AcpiLoadTables)
     97 
     98 
     99 /*******************************************************************************
    100  *
    101  * FUNCTION:    AcpiTbLoadNamespace
    102  *
    103  * PARAMETERS:  None
    104  *
    105  * RETURN:      Status
    106  *
    107  * DESCRIPTION: Load the namespace from the DSDT and all SSDTs/PSDTs found in
    108  *              the RSDT/XSDT.
    109  *
    110  ******************************************************************************/
    111 
    112 static ACPI_STATUS
    113 AcpiTbLoadNamespace (
    114     void)
    115 {
    116     ACPI_STATUS             Status;
    117     UINT32                  i;
    118     ACPI_TABLE_HEADER       *NewDsdt;
    119 
    120 
    121     ACPI_FUNCTION_TRACE (TbLoadNamespace);
    122 
    123 
    124     (void) AcpiUtAcquireMutex (ACPI_MTX_TABLES);
    125 
    126     /*
    127      * Load the namespace. The DSDT is required, but any SSDT and
    128      * PSDT tables are optional. Verify the DSDT.
    129      */
    130     if (!AcpiGbl_RootTableList.CurrentTableCount ||
    131         !ACPI_COMPARE_NAME (
    132             &(AcpiGbl_RootTableList.Tables[ACPI_TABLE_INDEX_DSDT].Signature),
    133             ACPI_SIG_DSDT) ||
    134          ACPI_FAILURE (AcpiTbValidateTable (
    135             &AcpiGbl_RootTableList.Tables[ACPI_TABLE_INDEX_DSDT])))
    136     {
    137         Status = AE_NO_ACPI_TABLES;
    138         goto UnlockAndExit;
    139     }
    140 
    141     /*
    142      * Save the DSDT pointer for simple access. This is the mapped memory
    143      * address. We must take care here because the address of the .Tables
    144      * array can change dynamically as tables are loaded at run-time. Note:
    145      * .Pointer field is not validated until after call to AcpiTbValidateTable.
    146      */
    147     AcpiGbl_DSDT = AcpiGbl_RootTableList.Tables[ACPI_TABLE_INDEX_DSDT].Pointer;
    148 
    149     /*
    150      * Optionally copy the entire DSDT to local memory (instead of simply
    151      * mapping it.) There are some BIOSs that corrupt or replace the original
    152      * DSDT, creating the need for this option. Default is FALSE, do not copy
    153      * the DSDT.
    154      */
    155     if (AcpiGbl_CopyDsdtLocally)
    156     {
    157         NewDsdt = AcpiTbCopyDsdt (ACPI_TABLE_INDEX_DSDT);
    158         if (NewDsdt)
    159         {
    160             AcpiGbl_DSDT = NewDsdt;
    161         }
    162     }
    163 
    164     /*
    165      * Save the original DSDT header for detection of table corruption
    166      * and/or replacement of the DSDT from outside the OS.
    167      */
    168     ACPI_MEMCPY (&AcpiGbl_OriginalDsdtHeader, AcpiGbl_DSDT,
    169         sizeof (ACPI_TABLE_HEADER));
    170 
    171     (void) AcpiUtReleaseMutex (ACPI_MTX_TABLES);
    172 
    173     /* Load and parse tables */
    174 
    175     Status = AcpiNsLoadTable (ACPI_TABLE_INDEX_DSDT, AcpiGbl_RootNode);
    176     if (ACPI_FAILURE (Status))
    177     {
    178         return_ACPI_STATUS (Status);
    179     }
    180 
    181     /* Load any SSDT or PSDT tables. Note: Loop leaves tables locked */
    182 
    183     (void) AcpiUtAcquireMutex (ACPI_MTX_TABLES);
    184     for (i = 0; i < AcpiGbl_RootTableList.CurrentTableCount; ++i)
    185     {
    186         if ((!ACPI_COMPARE_NAME (&(AcpiGbl_RootTableList.Tables[i].Signature),
    187                     ACPI_SIG_SSDT) &&
    188              !ACPI_COMPARE_NAME (&(AcpiGbl_RootTableList.Tables[i].Signature),
    189                     ACPI_SIG_PSDT)) ||
    190              ACPI_FAILURE (AcpiTbValidateTable (
    191                 &AcpiGbl_RootTableList.Tables[i])))
    192         {
    193             continue;
    194         }
    195 
    196         /* Ignore errors while loading tables, get as many as possible */
    197 
    198         (void) AcpiUtReleaseMutex (ACPI_MTX_TABLES);
    199         (void) AcpiNsLoadTable (i, AcpiGbl_RootNode);
    200         (void) AcpiUtAcquireMutex (ACPI_MTX_TABLES);
    201     }
    202 
    203     ACPI_INFO ((AE_INFO, "All ACPI Tables successfully acquired"));
    204 
    205 UnlockAndExit:
    206     (void) AcpiUtReleaseMutex (ACPI_MTX_TABLES);
    207     return_ACPI_STATUS (Status);
    208 }
    209 
    210 
    211 /*******************************************************************************
    212  *
    213  * FUNCTION:    AcpiInstallTable
    214  *
    215  * PARAMETERS:  Address             - Address of the ACPI table to be installed.
    216  *              Physical            - Whether the address is a physical table
    217  *                                    address or not
    218  *
    219  * RETURN:      Status
    220  *
    221  * DESCRIPTION: Dynamically install an ACPI table.
    222  *              Note: This function should only be invoked after
    223  *                    AcpiInitializeTables() and before AcpiLoadTables().
    224  *
    225  ******************************************************************************/
    226 
    227 ACPI_STATUS
    228 AcpiInstallTable (
    229     ACPI_PHYSICAL_ADDRESS   Address,
    230     BOOLEAN                 Physical)
    231 {
    232     ACPI_STATUS             Status;
    233     UINT8                   Flags;
    234     UINT32                  TableIndex;
    235 
    236 
    237     ACPI_FUNCTION_TRACE (AcpiInstallTable);
    238 
    239 
    240     if (Physical)
    241     {
    242         Flags = ACPI_TABLE_ORIGIN_EXTERNAL_VIRTUAL;
    243     }
    244     else
    245     {
    246         Flags = ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL;
    247     }
    248 
    249     Status = AcpiTbInstallStandardTable (Address, Flags,
    250         FALSE, FALSE, &TableIndex);
    251 
    252     return_ACPI_STATUS (Status);
    253 }
    254 
    255 ACPI_EXPORT_SYMBOL_INIT (AcpiInstallTable)
    256 
    257 
    258 /*******************************************************************************
    259  *
    260  * FUNCTION:    AcpiLoadTable
    261  *
    262  * PARAMETERS:  Table               - Pointer to a buffer containing the ACPI
    263  *                                    table to be loaded.
    264  *
    265  * RETURN:      Status
    266  *
    267  * DESCRIPTION: Dynamically load an ACPI table from the caller's buffer. Must
    268  *              be a valid ACPI table with a valid ACPI table header.
    269  *              Note1: Mainly intended to support hotplug addition of SSDTs.
    270  *              Note2: Does not copy the incoming table. User is responsible
    271  *              to ensure that the table is not deleted or unmapped.
    272  *
    273  ******************************************************************************/
    274 
    275 ACPI_STATUS
    276 AcpiLoadTable (
    277     ACPI_TABLE_HEADER       *Table)
    278 {
    279     ACPI_STATUS             Status;
    280     UINT32                  TableIndex;
    281 
    282 
    283     ACPI_FUNCTION_TRACE (AcpiLoadTable);
    284 
    285 
    286     /* Parameter validation */
    287 
    288     if (!Table)
    289     {
    290         return_ACPI_STATUS (AE_BAD_PARAMETER);
    291     }
    292 
    293     /* Must acquire the interpreter lock during this operation */
    294 
    295     Status = AcpiUtAcquireMutex (ACPI_MTX_INTERPRETER);
    296     if (ACPI_FAILURE (Status))
    297     {
    298         return_ACPI_STATUS (Status);
    299     }
    300 
    301     /* Install the table and load it into the namespace */
    302 
    303     ACPI_INFO ((AE_INFO, "Host-directed Dynamic ACPI Table Load:"));
    304     (void) AcpiUtAcquireMutex (ACPI_MTX_TABLES);
    305 
    306     Status = AcpiTbInstallStandardTable (ACPI_PTR_TO_PHYSADDR (Table),
    307                 ACPI_TABLE_ORIGIN_EXTERNAL_VIRTUAL, TRUE, FALSE,
    308                 &TableIndex);
    309 
    310     (void) AcpiUtReleaseMutex (ACPI_MTX_TABLES);
    311     if (ACPI_FAILURE (Status))
    312     {
    313         goto UnlockAndExit;
    314     }
    315 
    316     /*
    317      * Note: Now table is "INSTALLED", it must be validated before
    318      * using.
    319      */
    320     Status = AcpiTbValidateTable (&AcpiGbl_RootTableList.Tables[TableIndex]);
    321     if (ACPI_FAILURE (Status))
    322     {
    323         goto UnlockAndExit;
    324     }
    325 
    326     Status = AcpiNsLoadTable (TableIndex, AcpiGbl_RootNode);
    327 
    328     /* Invoke table handler if present */
    329 
    330     if (AcpiGbl_TableHandler)
    331     {
    332         (void) AcpiGbl_TableHandler (ACPI_TABLE_EVENT_LOAD, Table,
    333                     AcpiGbl_TableHandlerContext);
    334     }
    335 
    336 UnlockAndExit:
    337     (void) AcpiUtReleaseMutex (ACPI_MTX_INTERPRETER);
    338     return_ACPI_STATUS (Status);
    339 }
    340 
    341 ACPI_EXPORT_SYMBOL (AcpiLoadTable)
    342 
    343 
    344 /*******************************************************************************
    345  *
    346  * FUNCTION:    AcpiUnloadParentTable
    347  *
    348  * PARAMETERS:  Object              - Handle to any namespace object owned by
    349  *                                    the table to be unloaded
    350  *
    351  * RETURN:      Status
    352  *
    353  * DESCRIPTION: Via any namespace object within an SSDT or OEMx table, unloads
    354  *              the table and deletes all namespace objects associated with
    355  *              that table. Unloading of the DSDT is not allowed.
    356  *              Note: Mainly intended to support hotplug removal of SSDTs.
    357  *
    358  ******************************************************************************/
    359 
    360 ACPI_STATUS
    361 AcpiUnloadParentTable (
    362     ACPI_HANDLE             Object)
    363 {
    364     ACPI_NAMESPACE_NODE     *Node = ACPI_CAST_PTR (ACPI_NAMESPACE_NODE, Object);
    365     ACPI_STATUS             Status = AE_NOT_EXIST;
    366     ACPI_OWNER_ID           OwnerId;
    367     UINT32                  i;
    368 
    369 
    370     ACPI_FUNCTION_TRACE (AcpiUnloadParentTable);
    371 
    372 
    373     /* Parameter validation */
    374 
    375     if (!Object)
    376     {
    377         return_ACPI_STATUS (AE_BAD_PARAMETER);
    378     }
    379 
    380     /*
    381      * The node OwnerId is currently the same as the parent table ID.
    382      * However, this could change in the future.
    383      */
    384     OwnerId = Node->OwnerId;
    385     if (!OwnerId)
    386     {
    387         /* OwnerId==0 means DSDT is the owner. DSDT cannot be unloaded */
    388 
    389         return_ACPI_STATUS (AE_TYPE);
    390     }
    391 
    392     /* Must acquire the interpreter lock during this operation */
    393 
    394     Status = AcpiUtAcquireMutex (ACPI_MTX_INTERPRETER);
    395     if (ACPI_FAILURE (Status))
    396     {
    397         return_ACPI_STATUS (Status);
    398     }
    399 
    400     /* Find the table in the global table list */
    401 
    402     for (i = 0; i < AcpiGbl_RootTableList.CurrentTableCount; i++)
    403     {
    404         if (OwnerId != AcpiGbl_RootTableList.Tables[i].OwnerId)
    405         {
    406             continue;
    407         }
    408 
    409         /*
    410          * Allow unload of SSDT and OEMx tables only. Do not allow unload
    411          * of the DSDT. No other types of tables should get here, since
    412          * only these types can contain AML and thus are the only types
    413          * that can create namespace objects.
    414          */
    415         if (ACPI_COMPARE_NAME (
    416             AcpiGbl_RootTableList.Tables[i].Signature.Ascii,
    417             ACPI_SIG_DSDT))
    418         {
    419             Status = AE_TYPE;
    420             break;
    421         }
    422 
    423         /* Ensure the table is actually loaded */
    424 
    425         if (!AcpiTbIsTableLoaded (i))
    426         {
    427             Status = AE_NOT_EXIST;
    428             break;
    429         }
    430 
    431         /* Invoke table handler if present */
    432 
    433         if (AcpiGbl_TableHandler)
    434         {
    435             (void) AcpiGbl_TableHandler (ACPI_TABLE_EVENT_UNLOAD,
    436                         AcpiGbl_RootTableList.Tables[i].Pointer,
    437                         AcpiGbl_TableHandlerContext);
    438         }
    439 
    440         /*
    441          * Delete all namespace objects owned by this table. Note that
    442          * these objects can appear anywhere in the namespace by virtue
    443          * of the AML "Scope" operator. Thus, we need to track ownership
    444          * by an ID, not simply a position within the hierarchy.
    445          */
    446         Status = AcpiTbDeleteNamespaceByOwner (i);
    447         if (ACPI_FAILURE (Status))
    448         {
    449             break;
    450         }
    451 
    452         Status = AcpiTbReleaseOwnerId (i);
    453         AcpiTbSetTableLoadedFlag (i, FALSE);
    454         break;
    455     }
    456 
    457     (void) AcpiUtReleaseMutex (ACPI_MTX_INTERPRETER);
    458     return_ACPI_STATUS (Status);
    459 }
    460 
    461 ACPI_EXPORT_SYMBOL (AcpiUnloadParentTable)
    462