diff options
Diffstat (limited to 'drivers/acpi/acpica/tbxfload.c')
| -rw-r--r-- | drivers/acpi/acpica/tbxfload.c | 389 |
1 files changed, 389 insertions, 0 deletions
diff --git a/drivers/acpi/acpica/tbxfload.c b/drivers/acpi/acpica/tbxfload.c new file mode 100644 index 00000000000..f87cc63e69a --- /dev/null +++ b/drivers/acpi/acpica/tbxfload.c @@ -0,0 +1,389 @@ +/****************************************************************************** + * + * Module Name: tbxfload - Table load/unload external interfaces + * + *****************************************************************************/ + +/* + * Copyright (C) 2000 - 2012, 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 <linux/export.h> +#include <acpi/acpi.h> +#include "accommon.h" +#include "acnamesp.h" +#include "actables.h" + +#define _COMPONENT ACPI_TABLES +ACPI_MODULE_NAME("tbxfload") + +/* Local prototypes */ +static acpi_status acpi_tb_load_namespace(void); + +static int no_auto_ssdt; + +/******************************************************************************* + * + * FUNCTION: acpi_load_tables + * + * PARAMETERS: None + * + * RETURN: Status + * + * DESCRIPTION: Load the ACPI tables from the RSDT/XSDT + * + ******************************************************************************/ + +acpi_status acpi_load_tables(void) +{ + acpi_status status; + + ACPI_FUNCTION_TRACE(acpi_load_tables); + + /* Load the namespace from the tables */ + + status = acpi_tb_load_namespace(); + if (ACPI_FAILURE(status)) { + ACPI_EXCEPTION((AE_INFO, status, + "While loading namespace from ACPI tables")); + } + + return_ACPI_STATUS(status); +} + +ACPI_EXPORT_SYMBOL(acpi_load_tables) + +/******************************************************************************* + * + * FUNCTION: acpi_tb_load_namespace + * + * PARAMETERS: None + * + * RETURN: Status + * + * DESCRIPTION: Load the namespace from the DSDT and all SSDTs/PSDTs found in + * the RSDT/XSDT. + * + ******************************************************************************/ +static acpi_status acpi_tb_load_namespace(void) +{ + acpi_status status; + u32 i; + struct acpi_table_header *new_dsdt; + + ACPI_FUNCTION_TRACE(tb_load_namespace); + + (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES); + + /* + * Load the namespace. The DSDT is required, but any SSDT and + * PSDT tables are optional. Verify the DSDT. + */ + if (!acpi_gbl_root_table_list.current_table_count || + !ACPI_COMPARE_NAME(& + (acpi_gbl_root_table_list. + tables[ACPI_TABLE_INDEX_DSDT].signature), + ACPI_SIG_DSDT) + || + ACPI_FAILURE(acpi_tb_verify_table + (&acpi_gbl_root_table_list. + tables[ACPI_TABLE_INDEX_DSDT]))) { + status = AE_NO_ACPI_TABLES; + goto unlock_and_exit; + } + + /* + * Save the DSDT pointer for simple access. This is the mapped memory + * address. We must take care here because the address of the .Tables + * array can change dynamically as tables are loaded at run-time. Note: + * .Pointer field is not validated until after call to acpi_tb_verify_table. + */ + acpi_gbl_DSDT = + acpi_gbl_root_table_list.tables[ACPI_TABLE_INDEX_DSDT].pointer; + + /* + * Optionally copy the entire DSDT to local memory (instead of simply + * mapping it.) There are some BIOSs that corrupt or replace the original + * DSDT, creating the need for this option. Default is FALSE, do not copy + * the DSDT. + */ + if (acpi_gbl_copy_dsdt_locally) { + new_dsdt = acpi_tb_copy_dsdt(ACPI_TABLE_INDEX_DSDT); + if (new_dsdt) { + acpi_gbl_DSDT = new_dsdt; + } + } + + /* + * Save the original DSDT header for detection of table corruption + * and/or replacement of the DSDT from outside the OS. + */ + ACPI_MEMCPY(&acpi_gbl_original_dsdt_header, acpi_gbl_DSDT, + sizeof(struct acpi_table_header)); + + (void)acpi_ut_release_mutex(ACPI_MTX_TABLES); + + /* Load and parse tables */ + + status = acpi_ns_load_table(ACPI_TABLE_INDEX_DSDT, acpi_gbl_root_node); + if (ACPI_FAILURE(status)) { + return_ACPI_STATUS(status); + } + + /* Load any SSDT or PSDT tables. Note: Loop leaves tables locked */ + + (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES); + for (i = 0; i < acpi_gbl_root_table_list.current_table_count; ++i) { + if ((!ACPI_COMPARE_NAME + (&(acpi_gbl_root_table_list.tables[i].signature), + ACPI_SIG_SSDT) + && + !ACPI_COMPARE_NAME(& + (acpi_gbl_root_table_list.tables[i]. + signature), ACPI_SIG_PSDT)) + || + ACPI_FAILURE(acpi_tb_verify_table + (&acpi_gbl_root_table_list.tables[i]))) { + continue; + } + + if (no_auto_ssdt) { + printk(KERN_WARNING "ACPI: SSDT ignored due to \"acpi_no_auto_ssdt\"\n"); + continue; + } + + /* Ignore errors while loading tables, get as many as possible */ + + (void)acpi_ut_release_mutex(ACPI_MTX_TABLES); + (void)acpi_ns_load_table(i, acpi_gbl_root_node); + (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES); + } + + ACPI_DEBUG_PRINT((ACPI_DB_INIT, "ACPI Tables successfully acquired\n")); + + unlock_and_exit: + (void)acpi_ut_release_mutex(ACPI_MTX_TABLES); + return_ACPI_STATUS(status); +} + +/******************************************************************************* + * + * FUNCTION: acpi_load_table + * + * PARAMETERS: table - Pointer to a buffer containing the ACPI + * table to be loaded. + * + * RETURN: Status + * + * DESCRIPTION: Dynamically load an ACPI table from the caller's buffer. Must + * be a valid ACPI table with a valid ACPI table header. + * Note1: Mainly intended to support hotplug addition of SSDTs. + * Note2: Does not copy the incoming table. User is reponsible + * to ensure that the table is not deleted or unmapped. + * + ******************************************************************************/ + +acpi_status acpi_load_table(struct acpi_table_header *table) +{ + acpi_status status; + struct acpi_table_desc table_desc; + u32 table_index; + + ACPI_FUNCTION_TRACE(acpi_load_table); + + /* Parameter validation */ + + if (!table) { + return_ACPI_STATUS(AE_BAD_PARAMETER); + } + + /* Init local table descriptor */ + + ACPI_MEMSET(&table_desc, 0, sizeof(struct acpi_table_desc)); + table_desc.address = ACPI_PTR_TO_PHYSADDR(table); + table_desc.pointer = table; + table_desc.length = table->length; + table_desc.flags = ACPI_TABLE_ORIGIN_UNKNOWN; + + /* Must acquire the interpreter lock during this operation */ + + status = acpi_ut_acquire_mutex(ACPI_MTX_INTERPRETER); + if (ACPI_FAILURE(status)) { + return_ACPI_STATUS(status); + } + + /* Install the table and load it into the namespace */ + + ACPI_INFO((AE_INFO, "Host-directed Dynamic ACPI Table Load:")); + status = acpi_tb_add_table(&table_desc, &table_index); + if (ACPI_FAILURE(status)) { + goto unlock_and_exit; + } + + status = acpi_ns_load_table(table_index, acpi_gbl_root_node); + + /* Invoke table handler if present */ + + if (acpi_gbl_table_handler) { + (void)acpi_gbl_table_handler(ACPI_TABLE_EVENT_LOAD, table, + acpi_gbl_table_handler_context); + } + + unlock_and_exit: + (void)acpi_ut_release_mutex(ACPI_MTX_INTERPRETER); + return_ACPI_STATUS(status); +} + +ACPI_EXPORT_SYMBOL(acpi_load_table) + +/******************************************************************************* + * + * FUNCTION: acpi_unload_parent_table + * + * PARAMETERS: object - Handle to any namespace object owned by + * the table to be unloaded + * + * RETURN: Status + * + * DESCRIPTION: Via any namespace object within an SSDT or OEMx table, unloads + * the table and deletes all namespace objects associated with + * that table. Unloading of the DSDT is not allowed. + * Note: Mainly intended to support hotplug removal of SSDTs. + * + ******************************************************************************/ +acpi_status acpi_unload_parent_table(acpi_handle object) +{ + struct acpi_namespace_node *node = + ACPI_CAST_PTR(struct acpi_namespace_node, object); + acpi_status status = AE_NOT_EXIST; + acpi_owner_id owner_id; + u32 i; + + ACPI_FUNCTION_TRACE(acpi_unload_parent_table); + + /* Parameter validation */ + + if (!object) { + return_ACPI_STATUS(AE_BAD_PARAMETER); + } + + /* + * The node owner_id is currently the same as the parent table ID. + * However, this could change in the future. + */ + owner_id = node->owner_id; + if (!owner_id) { + + /* owner_id==0 means DSDT is the owner. DSDT cannot be unloaded */ + + return_ACPI_STATUS(AE_TYPE); + } + + /* Must acquire the interpreter lock during this operation */ + + status = acpi_ut_acquire_mutex(ACPI_MTX_INTERPRETER); + if (ACPI_FAILURE(status)) { + return_ACPI_STATUS(status); + } + + /* Find the table in the global table list */ + + for (i = 0; i < acpi_gbl_root_table_list.current_table_count; i++) { + if (owner_id != acpi_gbl_root_table_list.tables[i].owner_id) { + continue; + } + + /* + * Allow unload of SSDT and OEMx tables only. Do not allow unload + * of the DSDT. No other types of tables should get here, since + * only these types can contain AML and thus are the only types + * that can create namespace objects. + */ + if (ACPI_COMPARE_NAME + (acpi_gbl_root_table_list.tables[i].signature.ascii, + ACPI_SIG_DSDT)) { + status = AE_TYPE; + break; + } + + /* Ensure the table is actually loaded */ + + if (!acpi_tb_is_table_loaded(i)) { + status = AE_NOT_EXIST; + break; + } + + /* Invoke table handler if present */ + + if (acpi_gbl_table_handler) { + (void)acpi_gbl_table_handler(ACPI_TABLE_EVENT_UNLOAD, + acpi_gbl_root_table_list. + tables[i].pointer, + acpi_gbl_table_handler_context); + } + + /* + * Delete all namespace objects owned by this table. Note that + * these objects can appear anywhere in the namespace by virtue + * of the AML "Scope" operator. Thus, we need to track ownership + * by an ID, not simply a position within the hierarchy. + */ + status = acpi_tb_delete_namespace_by_owner(i); + if (ACPI_FAILURE(status)) { + break; + } + + status = acpi_tb_release_owner_id(i); + acpi_tb_set_table_loaded_flag(i, FALSE); + break; + } + + (void)acpi_ut_release_mutex(ACPI_MTX_INTERPRETER); + return_ACPI_STATUS(status); +} + +ACPI_EXPORT_SYMBOL(acpi_unload_parent_table) + +static int __init acpi_no_auto_ssdt_setup(char *s) { + + printk(KERN_NOTICE "ACPI: SSDT auto-load disabled\n"); + + no_auto_ssdt = 1; + + return 1; +} + +__setup("acpi_no_auto_ssdt", acpi_no_auto_ssdt_setup); |