Merge branch 'akpm'

[linux-2.6/next.git] / drivers / acpi / acpica / tbinstal.c

/******************************************************************************
 *
 * Module Name: tbinstal - ACPI table installation and removal
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2011, Intel Corp.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions, and the following disclaimer,
 *    without modification.
 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
 *    substantially similar to the "NO WARRANTY" disclaimer below
 *    ("Disclaimer") and any redistribution must be conditioned upon
 *    including a substantially similar Disclaimer requirement for further
 *    binary redistribution.
 * 3. Neither the names of the above-listed copyright holders nor the names
 *    of any contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * Alternatively, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") version 2 as published by the Free
 * Software Foundation.
 *
 * NO WARRANTY
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGES.
 */

#include <acpi/acpi.h>
#include "accommon.h"
#include "acnamesp.h"
#include "actables.h"

#define _COMPONENT          ACPI_TABLES
ACPI_MODULE_NAME("tbinstal")

/******************************************************************************
 *
 * FUNCTION:    acpi_tb_verify_table
 *
 * PARAMETERS:  table_desc          - table
 *
 * RETURN:      Status
 *
 * DESCRIPTION: this function is called to verify and map table
 *
 *****************************************************************************/
acpi_status acpi_tb_verify_table(struct acpi_table_desc *table_desc)
{
        acpi_status status = AE_OK;

        ACPI_FUNCTION_TRACE(tb_verify_table);

        /* Map the table if necessary */

        if (!table_desc->pointer) {
                if ((table_desc->flags & ACPI_TABLE_ORIGIN_MASK) ==
                    ACPI_TABLE_ORIGIN_MAPPED) {
                        table_desc->pointer =
                            acpi_os_map_memory(table_desc->address,
                                               table_desc->length);
                }
                if (!table_desc->pointer) {
                        return_ACPI_STATUS(AE_NO_MEMORY);
                }
        }

        /* FACS is the odd table, has no standard ACPI header and no checksum */

        if (!ACPI_COMPARE_NAME(&table_desc->signature, ACPI_SIG_FACS)) {

                /* Always calculate checksum, ignore bad checksum if requested */

                status =
                    acpi_tb_verify_checksum(table_desc->pointer,
                                            table_desc->length);
        }

        return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_tb_add_table
 *
 * PARAMETERS:  table_desc          - Table descriptor
 *              table_index         - Where the table index is returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: This function is called to add an ACPI table. It is used to
 *              dynamically load tables via the Load and load_table AML
 *              operators.
 *
 ******************************************************************************/

acpi_status
acpi_tb_add_table(struct acpi_table_desc *table_desc, u32 *table_index)
{
        u32 i;
        acpi_status status = AE_OK;
        struct acpi_table_header *override_table = NULL;

        ACPI_FUNCTION_TRACE(tb_add_table);

        if (!table_desc->pointer) {
                status = acpi_tb_verify_table(table_desc);
                if (ACPI_FAILURE(status) || !table_desc->pointer) {
                        return_ACPI_STATUS(status);
                }
        }

        /*
         * Validate the incoming table signature.
         *
         * 1) Originally, we checked the table signature for "SSDT" or "PSDT".
         * 2) We added support for OEMx tables, signature "OEM".
         * 3) Valid tables were encountered with a null signature, so we just
         *    gave up on validating the signature, (05/2008).
         * 4) We encountered non-AML tables such as the MADT, which caused
         *    interpreter errors and kernel faults. So now, we once again allow
         *    only "SSDT", "OEMx", and now, also a null signature. (05/2011).
         */
        if ((table_desc->pointer->signature[0] != 0x00) &&
            (!ACPI_COMPARE_NAME(table_desc->pointer->signature, ACPI_SIG_SSDT))
            && (ACPI_STRNCMP(table_desc->pointer->signature, "OEM", 3))) {
                ACPI_ERROR((AE_INFO,
                            "Table has invalid signature [%4.4s] (0x%8.8X), must be SSDT or OEMx",
                            acpi_ut_valid_acpi_name(*(u32 *)table_desc->
                                                    pointer->
                                                    signature) ? table_desc->
                            pointer->signature : "????",
                            *(u32 *)table_desc->pointer->signature));

                return_ACPI_STATUS(AE_BAD_SIGNATURE);
        }

        (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);

        /* Check if table is already registered */

        for (i = 0; i < acpi_gbl_root_table_list.current_table_count; ++i) {
                if (!acpi_gbl_root_table_list.tables[i].pointer) {
                        status =
                            acpi_tb_verify_table(&acpi_gbl_root_table_list.
                                                 tables[i]);
                        if (ACPI_FAILURE(status)
                            || !acpi_gbl_root_table_list.tables[i].pointer) {
                                continue;
                        }
                }

                /*
                 * Check for a table match on the entire table length,
                 * not just the header.
                 */
                if (table_desc->length !=
                    acpi_gbl_root_table_list.tables[i].length) {
                        continue;
                }

                if (ACPI_MEMCMP(table_desc->pointer,
                                acpi_gbl_root_table_list.tables[i].pointer,
                                acpi_gbl_root_table_list.tables[i].length)) {
                        continue;
                }

                /*
                 * Note: the current mechanism does not unregister a table if it is
                 * dynamically unloaded. The related namespace entries are deleted,
                 * but the table remains in the root table list.
                 *
                 * The assumption here is that the number of different tables that
                 * will be loaded is actually small, and there is minimal overhead
                 * in just keeping the table in case it is needed again.
                 *
                 * If this assumption changes in the future (perhaps on large
                 * machines with many table load/unload operations), tables will
                 * need to be unregistered when they are unloaded, and slots in the
                 * root table list should be reused when empty.
                 */

                /*
                 * Table is already registered.
                 * We can delete the table that was passed as a parameter.
                 */
                acpi_tb_delete_table(table_desc);
                *table_index = i;

                if (acpi_gbl_root_table_list.tables[i].
                    flags & ACPI_TABLE_IS_LOADED) {

                        /* Table is still loaded, this is an error */

                        status = AE_ALREADY_EXISTS;
                        goto release;
                } else {
                        /* Table was unloaded, allow it to be reloaded */

                        table_desc->pointer =
                            acpi_gbl_root_table_list.tables[i].pointer;
                        table_desc->address =
                            acpi_gbl_root_table_list.tables[i].address;
                        status = AE_OK;
                        goto print_header;
                }
        }

        /*
         * ACPI Table Override:
         * Allow the host to override dynamically loaded tables.
         */
        status = acpi_os_table_override(table_desc->pointer, &override_table);
        if (ACPI_SUCCESS(status) && override_table) {
                ACPI_INFO((AE_INFO,
                           "%4.4s @ 0x%p Table override, replaced with:",
                           table_desc->pointer->signature,
                           ACPI_CAST_PTR(void, table_desc->address)));

                /* We can delete the table that was passed as a parameter */

                acpi_tb_delete_table(table_desc);

                /* Setup descriptor for the new table */

                table_desc->address = ACPI_PTR_TO_PHYSADDR(override_table);
                table_desc->pointer = override_table;
                table_desc->length = override_table->length;
                table_desc->flags = ACPI_TABLE_ORIGIN_OVERRIDE;
        }

        /* Add the table to the global root table list */

        status = acpi_tb_store_table(table_desc->address, table_desc->pointer,
                                     table_desc->length, table_desc->flags,
                                     table_index);
        if (ACPI_FAILURE(status)) {
                goto release;
        }

      print_header:
        acpi_tb_print_table_header(table_desc->address, table_desc->pointer);

      release:
        (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
        return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_tb_resize_root_table_list
 *
 * PARAMETERS:  None
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Expand the size of global table array
 *
 ******************************************************************************/

acpi_status acpi_tb_resize_root_table_list(void)
{
        struct acpi_table_desc *tables;

        ACPI_FUNCTION_TRACE(tb_resize_root_table_list);

        /* allow_resize flag is a parameter to acpi_initialize_tables */

        if (!(acpi_gbl_root_table_list.flags & ACPI_ROOT_ALLOW_RESIZE)) {
                ACPI_ERROR((AE_INFO,
                            "Resize of Root Table Array is not allowed"));
                return_ACPI_STATUS(AE_SUPPORT);
        }

        /* Increase the Table Array size */

        tables = ACPI_ALLOCATE_ZEROED(((acpi_size) acpi_gbl_root_table_list.
                                       max_table_count +
                                       ACPI_ROOT_TABLE_SIZE_INCREMENT) *
                                      sizeof(struct acpi_table_desc));
        if (!tables) {
                ACPI_ERROR((AE_INFO,
                            "Could not allocate new root table array"));
                return_ACPI_STATUS(AE_NO_MEMORY);
        }

        /* Copy and free the previous table array */

        if (acpi_gbl_root_table_list.tables) {
                ACPI_MEMCPY(tables, acpi_gbl_root_table_list.tables,
                            (acpi_size) acpi_gbl_root_table_list.
                            max_table_count * sizeof(struct acpi_table_desc));

                if (acpi_gbl_root_table_list.flags & ACPI_ROOT_ORIGIN_ALLOCATED) {
                        ACPI_FREE(acpi_gbl_root_table_list.tables);
                }
        }

        acpi_gbl_root_table_list.tables = tables;
        acpi_gbl_root_table_list.max_table_count +=
            ACPI_ROOT_TABLE_SIZE_INCREMENT;
        acpi_gbl_root_table_list.flags |= (u8)ACPI_ROOT_ORIGIN_ALLOCATED;

        return_ACPI_STATUS(AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_tb_store_table
 *
 * PARAMETERS:  Address             - Table address
 *              Table               - Table header
 *              Length              - Table length
 *              Flags               - flags
 *
 * RETURN:      Status and table index.
 *
 * DESCRIPTION: Add an ACPI table to the global table list
 *
 ******************************************************************************/

acpi_status
acpi_tb_store_table(acpi_physical_address address,
                    struct acpi_table_header *table,
                    u32 length, u8 flags, u32 *table_index)
{
        acpi_status status;
        struct acpi_table_desc *new_table;

        /* Ensure that there is room for the table in the Root Table List */

        if (acpi_gbl_root_table_list.current_table_count >=
            acpi_gbl_root_table_list.max_table_count) {
                status = acpi_tb_resize_root_table_list();
                if (ACPI_FAILURE(status)) {
                        return (status);
                }
        }

        new_table =
            &acpi_gbl_root_table_list.tables[acpi_gbl_root_table_list.
                                             current_table_count];

        /* Initialize added table */

        new_table->address = address;
        new_table->pointer = table;
        new_table->length = length;
        new_table->owner_id = 0;
        new_table->flags = flags;

        ACPI_MOVE_32_TO_32(&new_table->signature, table->signature);

        *table_index = acpi_gbl_root_table_list.current_table_count;
        acpi_gbl_root_table_list.current_table_count++;
        return (AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_tb_delete_table
 *
 * PARAMETERS:  table_index         - Table index
 *
 * RETURN:      None
 *
 * DESCRIPTION: Delete one internal ACPI table
 *
 ******************************************************************************/

void acpi_tb_delete_table(struct acpi_table_desc *table_desc)
{
        /* Table must be mapped or allocated */
        if (!table_desc->pointer) {
                return;
        }
        switch (table_desc->flags & ACPI_TABLE_ORIGIN_MASK) {
        case ACPI_TABLE_ORIGIN_MAPPED:
                acpi_os_unmap_memory(table_desc->pointer, table_desc->length);
                break;
        case ACPI_TABLE_ORIGIN_ALLOCATED:
                ACPI_FREE(table_desc->pointer);
                break;
        default:;
        }

        table_desc->pointer = NULL;
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_tb_terminate
 *
 * PARAMETERS:  None
 *
 * RETURN:      None
 *
 * DESCRIPTION: Delete all internal ACPI tables
 *
 ******************************************************************************/

void acpi_tb_terminate(void)
{
        u32 i;

        ACPI_FUNCTION_TRACE(tb_terminate);

        (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);

        /* Delete the individual tables */

        for (i = 0; i < acpi_gbl_root_table_list.current_table_count; i++) {
                acpi_tb_delete_table(&acpi_gbl_root_table_list.tables[i]);
        }

        /*
         * Delete the root table array if allocated locally. Array cannot be
         * mapped, so we don't need to check for that flag.
         */
        if (acpi_gbl_root_table_list.flags & ACPI_ROOT_ORIGIN_ALLOCATED) {
                ACPI_FREE(acpi_gbl_root_table_list.tables);
        }

        acpi_gbl_root_table_list.tables = NULL;
        acpi_gbl_root_table_list.flags = 0;
        acpi_gbl_root_table_list.current_table_count = 0;

        ACPI_DEBUG_PRINT((ACPI_DB_INFO, "ACPI Tables freed\n"));
        (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_tb_delete_namespace_by_owner
 *
 * PARAMETERS:  table_index         - Table index
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Delete all namespace objects created when this table was loaded.
 *
 ******************************************************************************/

acpi_status acpi_tb_delete_namespace_by_owner(u32 table_index)
{
        acpi_owner_id owner_id;
        acpi_status status;

        ACPI_FUNCTION_TRACE(tb_delete_namespace_by_owner);

        status = acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
        if (ACPI_FAILURE(status)) {
                return_ACPI_STATUS(status);
        }

        if (table_index >= acpi_gbl_root_table_list.current_table_count) {

                /* The table index does not exist */

                (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
                return_ACPI_STATUS(AE_NOT_EXIST);
        }

        /* Get the owner ID for this table, used to delete namespace nodes */

        owner_id = acpi_gbl_root_table_list.tables[table_index].owner_id;
        (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);

        /*
         * Need to acquire the namespace writer lock to prevent interference
         * with any concurrent namespace walks. The interpreter must be
         * released during the deletion since the acquisition of the deletion
         * lock may block, and also since the execution of a namespace walk
         * must be allowed to use the interpreter.
         */
        (void)acpi_ut_release_mutex(ACPI_MTX_INTERPRETER);
        status = acpi_ut_acquire_write_lock(&acpi_gbl_namespace_rw_lock);

        acpi_ns_delete_namespace_by_owner(owner_id);
        if (ACPI_FAILURE(status)) {
                return_ACPI_STATUS(status);
        }

        acpi_ut_release_write_lock(&acpi_gbl_namespace_rw_lock);

        status = acpi_ut_acquire_mutex(ACPI_MTX_INTERPRETER);
        return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_tb_allocate_owner_id
 *
 * PARAMETERS:  table_index         - Table index
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Allocates owner_id in table_desc
 *
 ******************************************************************************/

acpi_status acpi_tb_allocate_owner_id(u32 table_index)
{
        acpi_status status = AE_BAD_PARAMETER;

        ACPI_FUNCTION_TRACE(tb_allocate_owner_id);

        (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
        if (table_index < acpi_gbl_root_table_list.current_table_count) {
                status = acpi_ut_allocate_owner_id
                    (&(acpi_gbl_root_table_list.tables[table_index].owner_id));
        }

        (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
        return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_tb_release_owner_id
 *
 * PARAMETERS:  table_index         - Table index
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Releases owner_id in table_desc
 *
 ******************************************************************************/

acpi_status acpi_tb_release_owner_id(u32 table_index)
{
        acpi_status status = AE_BAD_PARAMETER;

        ACPI_FUNCTION_TRACE(tb_release_owner_id);

        (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
        if (table_index < acpi_gbl_root_table_list.current_table_count) {
                acpi_ut_release_owner_id(&
                                         (acpi_gbl_root_table_list.
                                          tables[table_index].owner_id));
                status = AE_OK;
        }

        (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
        return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_tb_get_owner_id
 *
 * PARAMETERS:  table_index         - Table index
 *              owner_id            - Where the table owner_id is returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: returns owner_id for the ACPI table
 *
 ******************************************************************************/

acpi_status acpi_tb_get_owner_id(u32 table_index, acpi_owner_id *owner_id)
{
        acpi_status status = AE_BAD_PARAMETER;

        ACPI_FUNCTION_TRACE(tb_get_owner_id);

        (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
        if (table_index < acpi_gbl_root_table_list.current_table_count) {
                *owner_id =
                    acpi_gbl_root_table_list.tables[table_index].owner_id;
                status = AE_OK;
        }

        (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
        return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_tb_is_table_loaded
 *
 * PARAMETERS:  table_index         - Table index
 *
 * RETURN:      Table Loaded Flag
 *
 ******************************************************************************/

u8 acpi_tb_is_table_loaded(u32 table_index)
{
        u8 is_loaded = FALSE;

        (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
        if (table_index < acpi_gbl_root_table_list.current_table_count) {
                is_loaded = (u8)
                    (acpi_gbl_root_table_list.tables[table_index].flags &
                     ACPI_TABLE_IS_LOADED);
        }

        (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
        return (is_loaded);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_tb_set_table_loaded_flag
 *
 * PARAMETERS:  table_index         - Table index
 *              is_loaded           - TRUE if table is loaded, FALSE otherwise
 *
 * RETURN:      None
 *
 * DESCRIPTION: Sets the table loaded flag to either TRUE or FALSE.
 *
 ******************************************************************************/

void acpi_tb_set_table_loaded_flag(u32 table_index, u8 is_loaded)
{

        (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
        if (table_index < acpi_gbl_root_table_list.current_table_count) {
                if (is_loaded) {
                        acpi_gbl_root_table_list.tables[table_index].flags |=
                            ACPI_TABLE_IS_LOADED;
                } else {
                        acpi_gbl_root_table_list.tables[table_index].flags &=
                            ~ACPI_TABLE_IS_LOADED;
                }
        }

        (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
}