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74f51b80a0
ACPICA commit 767ee53354e0c4b7e8e7c57c6dd7bf569f0d52bb There are issues related to the namespace/interpreter locks, which causes several ACPI functionalities not specification compliant. The lock issues were detectec when we were trying to fix the functionalities (please see Link # [1] for the details). What's the lock issues? Let's first look into the namespace/interpreter lock usages inside of the object evaluation and the table loading which are the key AML interpretion code paths: Table loading: acpi_ns_load_table L(Namespace) acpi_ns_parse_table acpi_ns_one_complete_parse(LOAD_PASS1/LOAD_PASS2) acpi_ds_load1_begion_op acpi_ds_load1_end_op acpi_ds_load2_begion_op acpi_ds_load2_end_op U(Namespace) Object evaluation: acpi_ns_evaluate L(Interpreter) acpi_ps_execute_method acpi_ds_exec_begin_op acpi_ds_exec_end_op U(Interpreter) acpi_ns_load_table L(Namespace) U(Namespace) acpi_ev_initialize_region L(Namespace) U(Namespace) address_space.Setup address_space.Handler acpi_os_wait_semaphore acpi_os_acquire_mutex acpi_os_sleep L(Interpreter) U(Interpreter) L(Interpreter) acpi_ex_resolve_node_to_value U(Interpreter) acpi_ns_check_return_value Where: 1. L(Interpreter) means acquire(MTX_INTERPRETER); 2. U(Interpreter) means release(MTX_INTERPRETER); 3. L(Namespace) means acquire(MTX_NAMESPACE); 4. U(Namespace) means release(MTX_NAMESPACE); We can see that acpi_ns_exec_module_code() (which invokes acpi_ns_evaluate) is implemented in a deferred way just in order to avoid to reacquire the namespace lock. This is in fact the root cause of many other ACPICA issues: 1. We now know for sure that the module code should be executed right in place by the Windows AML interpreter. So in the current design, if the region initializations/accesses or the table loadings (where the namespace surely should be locked again) happening during the table loading period, dead lock could happen because ACPICA never unlocks the namespace during the AML interpretion. 2. ACPICA interpreter just ensures that all static namespace nodes (named objects created during the acpi_load_tables()) are created (acpi_ns_lookup()) with the correct lock held, but doesn't ensure that the named objects created by the control method are created with the same correct lock held. It requires the control methods to be executed in a serial way after "loading a table", that's why ACPICA requires method auto serialization. This patch fixes these software design issues by extending interpreter enter/exit APIs to hold both interpreter/namespace locks to ensure the lock order correctness, so that we can get these code paths: Table loading: acpi_ns_load_table E(Interpreter) acpi_ns_parse_table acpi_ns_one_complete_parse acpi_ns_execute_table X(Interpreter) acpi_ns_load_table acpi_ev_initialize_region address_space.Setup address_space.Handler acpi_os_wait_semaphore acpi_os_acquire_mutex acpi_os_sleep E(Interpreter) X(Interpreter) Object evaluation: acpi_ns_evaluate E(Interpreter) acpi_ps_execute_method X(Interpreter) acpi_ns_load_table acpi_ev_initialize_region address_space.Setup address_space.Handler acpi_os_wait_semaphore acpi_os_acquire_mutex acpi_os_sleep E(Interpreter) X(Interpreter) Where: 1. E(Interpreter) means acquire(MTX_INTERPRETER, MTX_NAMESPACE); 2. X(Interpreter) means release(MTX_NAMESPACE, MTX_INTERPRETER); After this change, we can see: 1. All namespace nodes creations are locked by the namespace lock. 2. All namespace nodes referencing are locked with the same lock. 3. But we also can notice a defact that, all namespace nodes deletions could be affected by this change. As a consequence, acpi_ns_delete_namespace_subtree() may delete a static namespace node that is still referenced by the interpreter (for example, the parser scopes). Currently, we needn't worry about the last defact because in ACPICA, table unloading is not fully functioning, its design strictly relies on the fact that when the namespace deletion happens, either the AML table or the OSPMs should have been notified and thus either the AML table or the OSPMs shouldn't reference deletion-related namespace nodes during the namespace deletion. And this change still works with the above restrictions applied. While making this a-step-forward helps us to correct the wrong grammar to pull many things back to the correct rail. And pulling things back to the correct rail in return makes it possible for us to support fully functioning table unloading after doing many cleanups. While this patch is generated, all namespace locks are examined to ensure that they can meet either of the following pattens: 1. L(Namespace) U(Namespace) 2. E(Interpreter) X(Interpreter) 3. E(Interpreter) X(Interpreter) L(Namespace) U(Namespace) E(Interpreter) X(Interpreter) We ensure this by adding X(Interpreter)/E(Interpreter) or removing U(Namespace)/L(Namespace) for those currently are executed in the following order: E(Interpreter) L(Namespace) U(Namespace) X(Interpreter) And adding E(Interpreter)/X(Interpreter) for those currently are executed in the following order: X(Interpreter) E(Interpreter) Originally, the interpreter lock is held for the execution AML opcodes, the namespace lock is held for the named object creation AML opcodes. Since they are actually same in MS interpreter (can all be executed during the table loading), we can combine the 2 locks and tune the locking code better in this way. Lv Zheng. Link: https://bugzilla.kernel.org/show_bug.cgi?id=153541 # [1] Link: https://bugzilla.kernel.org/show_bug.cgi?id=121701 # [1] Link: https://bugs.acpica.org/show_bug.cgi?id=1323 Link: https://github.com/acpica/acpica/commit/767ee533 Reported-and-tested-by: Mika Westerberg <mika.westerberg@linux.intel.com> Reported-and-tested-by: Greg White <gwhite@kupulau.com> Reported-and-tested-by: Dutch Guy <lucht_piloot@gmx.net> Signed-off-by: Lv Zheng <lv.zheng@intel.com> Signed-off-by: Bob Moore <robert.moore@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
632 lines
18 KiB
C
632 lines
18 KiB
C
/******************************************************************************
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*
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* Module Name: exconfig - Namespace reconfiguration (Load/Unload opcodes)
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*
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*****************************************************************************/
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/*
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* Copyright (C) 2000 - 2016, Intel Corp.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions, and the following disclaimer,
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* without modification.
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* 2. Redistributions in binary form must reproduce at minimum a disclaimer
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* substantially similar to the "NO WARRANTY" disclaimer below
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* ("Disclaimer") and any redistribution must be conditioned upon
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* including a substantially similar Disclaimer requirement for further
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* binary redistribution.
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* 3. Neither the names of the above-listed copyright holders nor the names
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* of any contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* NO WARRANTY
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGES.
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*/
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#include <acpi/acpi.h>
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#include "accommon.h"
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#include "acinterp.h"
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#include "acnamesp.h"
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#include "actables.h"
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#include "acdispat.h"
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#include "acevents.h"
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#include "amlcode.h"
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#define _COMPONENT ACPI_EXECUTER
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ACPI_MODULE_NAME("exconfig")
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/* Local prototypes */
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static acpi_status
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acpi_ex_add_table(u32 table_index,
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struct acpi_namespace_node *parent_node,
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union acpi_operand_object **ddb_handle);
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static acpi_status
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acpi_ex_region_read(union acpi_operand_object *obj_desc,
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u32 length, u8 *buffer);
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/*******************************************************************************
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*
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* FUNCTION: acpi_ex_add_table
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*
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* PARAMETERS: table - Pointer to raw table
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* parent_node - Where to load the table (scope)
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* ddb_handle - Where to return the table handle.
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*
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* RETURN: Status
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*
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* DESCRIPTION: Common function to Install and Load an ACPI table with a
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* returned table handle.
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*
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******************************************************************************/
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static acpi_status
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acpi_ex_add_table(u32 table_index,
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struct acpi_namespace_node *parent_node,
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union acpi_operand_object **ddb_handle)
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{
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union acpi_operand_object *obj_desc;
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acpi_status status;
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acpi_owner_id owner_id;
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ACPI_FUNCTION_TRACE(ex_add_table);
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/* Create an object to be the table handle */
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obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_LOCAL_REFERENCE);
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if (!obj_desc) {
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return_ACPI_STATUS(AE_NO_MEMORY);
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}
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/* Init the table handle */
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obj_desc->common.flags |= AOPOBJ_DATA_VALID;
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obj_desc->reference.class = ACPI_REFCLASS_TABLE;
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*ddb_handle = obj_desc;
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/* Install the new table into the local data structures */
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obj_desc->reference.value = table_index;
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/* Add the table to the namespace */
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status = acpi_ns_load_table(table_index, parent_node);
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if (ACPI_FAILURE(status)) {
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acpi_ut_remove_reference(obj_desc);
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*ddb_handle = NULL;
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return_ACPI_STATUS(status);
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}
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/* Execute any module-level code that was found in the table */
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acpi_ex_exit_interpreter();
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if (!acpi_gbl_parse_table_as_term_list
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&& acpi_gbl_group_module_level_code) {
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acpi_ns_exec_module_code_list();
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}
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acpi_ex_enter_interpreter();
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/*
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* Update GPEs for any new _Lxx/_Exx methods. Ignore errors. The host is
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* responsible for discovering any new wake GPEs by running _PRW methods
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* that may have been loaded by this table.
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*/
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status = acpi_tb_get_owner_id(table_index, &owner_id);
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if (ACPI_SUCCESS(status)) {
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acpi_ev_update_gpes(owner_id);
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}
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return_ACPI_STATUS(AE_OK);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ex_load_table_op
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*
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* PARAMETERS: walk_state - Current state with operands
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* return_desc - Where to store the return object
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*
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* RETURN: Status
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*
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* DESCRIPTION: Load an ACPI table from the RSDT/XSDT
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*
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******************************************************************************/
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acpi_status
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acpi_ex_load_table_op(struct acpi_walk_state *walk_state,
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union acpi_operand_object **return_desc)
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{
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acpi_status status;
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union acpi_operand_object **operand = &walk_state->operands[0];
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struct acpi_namespace_node *parent_node;
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struct acpi_namespace_node *start_node;
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struct acpi_namespace_node *parameter_node = NULL;
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union acpi_operand_object *ddb_handle;
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struct acpi_table_header *table;
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u32 table_index;
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ACPI_FUNCTION_TRACE(ex_load_table_op);
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/* Find the ACPI table in the RSDT/XSDT */
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status = acpi_tb_find_table(operand[0]->string.pointer,
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operand[1]->string.pointer,
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operand[2]->string.pointer, &table_index);
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if (ACPI_FAILURE(status)) {
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if (status != AE_NOT_FOUND) {
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return_ACPI_STATUS(status);
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}
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/* Table not found, return an Integer=0 and AE_OK */
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ddb_handle = acpi_ut_create_integer_object((u64) 0);
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if (!ddb_handle) {
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return_ACPI_STATUS(AE_NO_MEMORY);
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}
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*return_desc = ddb_handle;
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return_ACPI_STATUS(AE_OK);
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}
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/* Default nodes */
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start_node = walk_state->scope_info->scope.node;
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parent_node = acpi_gbl_root_node;
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/* root_path (optional parameter) */
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if (operand[3]->string.length > 0) {
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/*
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* Find the node referenced by the root_path_string. This is the
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* location within the namespace where the table will be loaded.
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*/
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status = acpi_ns_get_node_unlocked(start_node,
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operand[3]->string.pointer,
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ACPI_NS_SEARCH_PARENT,
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&parent_node);
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if (ACPI_FAILURE(status)) {
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return_ACPI_STATUS(status);
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}
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}
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/* parameter_path (optional parameter) */
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if (operand[4]->string.length > 0) {
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if ((operand[4]->string.pointer[0] != AML_ROOT_PREFIX) &&
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(operand[4]->string.pointer[0] != AML_PARENT_PREFIX)) {
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/*
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* Path is not absolute, so it will be relative to the node
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* referenced by the root_path_string (or the NS root if omitted)
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*/
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start_node = parent_node;
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}
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/* Find the node referenced by the parameter_path_string */
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status = acpi_ns_get_node_unlocked(start_node,
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operand[4]->string.pointer,
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ACPI_NS_SEARCH_PARENT,
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¶meter_node);
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if (ACPI_FAILURE(status)) {
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return_ACPI_STATUS(status);
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}
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}
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/* Load the table into the namespace */
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status = acpi_ex_add_table(table_index, parent_node, &ddb_handle);
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if (ACPI_FAILURE(status)) {
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return_ACPI_STATUS(status);
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}
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/* Parameter Data (optional) */
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if (parameter_node) {
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/* Store the parameter data into the optional parameter object */
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status = acpi_ex_store(operand[5],
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ACPI_CAST_PTR(union acpi_operand_object,
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parameter_node),
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walk_state);
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if (ACPI_FAILURE(status)) {
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(void)acpi_ex_unload_table(ddb_handle);
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acpi_ut_remove_reference(ddb_handle);
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return_ACPI_STATUS(status);
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}
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}
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status = acpi_get_table_by_index(table_index, &table);
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if (ACPI_SUCCESS(status)) {
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ACPI_INFO(("Dynamic OEM Table Load:"));
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acpi_tb_print_table_header(0, table);
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}
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/* Invoke table handler if present */
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if (acpi_gbl_table_handler) {
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(void)acpi_gbl_table_handler(ACPI_TABLE_EVENT_LOAD, table,
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acpi_gbl_table_handler_context);
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}
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*return_desc = ddb_handle;
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return_ACPI_STATUS(status);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ex_region_read
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*
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* PARAMETERS: obj_desc - Region descriptor
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* length - Number of bytes to read
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* buffer - Pointer to where to put the data
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*
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* RETURN: Status
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*
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* DESCRIPTION: Read data from an operation region. The read starts from the
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* beginning of the region.
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*
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******************************************************************************/
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static acpi_status
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acpi_ex_region_read(union acpi_operand_object *obj_desc, u32 length, u8 *buffer)
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{
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acpi_status status;
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u64 value;
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u32 region_offset = 0;
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u32 i;
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/* Bytewise reads */
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for (i = 0; i < length; i++) {
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status =
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acpi_ev_address_space_dispatch(obj_desc, NULL, ACPI_READ,
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region_offset, 8, &value);
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if (ACPI_FAILURE(status)) {
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return (status);
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}
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*buffer = (u8)value;
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buffer++;
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region_offset++;
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}
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return (AE_OK);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ex_load_op
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*
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* PARAMETERS: obj_desc - Region or Buffer/Field where the table will be
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* obtained
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* target - Where a handle to the table will be stored
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* walk_state - Current state
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*
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* RETURN: Status
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*
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* DESCRIPTION: Load an ACPI table from a field or operation region
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*
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* NOTE: Region Fields (Field, bank_field, index_fields) are resolved to buffer
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* objects before this code is reached.
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*
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* If source is an operation region, it must refer to system_memory, as
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* per the ACPI specification.
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*
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******************************************************************************/
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acpi_status
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acpi_ex_load_op(union acpi_operand_object *obj_desc,
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union acpi_operand_object *target,
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struct acpi_walk_state *walk_state)
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{
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union acpi_operand_object *ddb_handle;
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struct acpi_table_header *table_header;
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struct acpi_table_header *table;
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u32 table_index;
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acpi_status status;
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u32 length;
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ACPI_FUNCTION_TRACE(ex_load_op);
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/* Source Object can be either an op_region or a Buffer/Field */
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switch (obj_desc->common.type) {
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case ACPI_TYPE_REGION:
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ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
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"Load table from Region %p\n", obj_desc));
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/* Region must be system_memory (from ACPI spec) */
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if (obj_desc->region.space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY) {
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return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
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}
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/*
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* If the Region Address and Length have not been previously
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* evaluated, evaluate them now and save the results.
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*/
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if (!(obj_desc->common.flags & AOPOBJ_DATA_VALID)) {
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status = acpi_ds_get_region_arguments(obj_desc);
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if (ACPI_FAILURE(status)) {
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return_ACPI_STATUS(status);
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}
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}
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/* Get the table header first so we can get the table length */
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table_header = ACPI_ALLOCATE(sizeof(struct acpi_table_header));
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if (!table_header) {
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return_ACPI_STATUS(AE_NO_MEMORY);
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}
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status =
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acpi_ex_region_read(obj_desc,
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sizeof(struct acpi_table_header),
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ACPI_CAST_PTR(u8, table_header));
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length = table_header->length;
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ACPI_FREE(table_header);
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if (ACPI_FAILURE(status)) {
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return_ACPI_STATUS(status);
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}
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/* Must have at least an ACPI table header */
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if (length < sizeof(struct acpi_table_header)) {
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return_ACPI_STATUS(AE_INVALID_TABLE_LENGTH);
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}
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/*
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* The original implementation simply mapped the table, with no copy.
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* However, the memory region is not guaranteed to remain stable and
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* we must copy the table to a local buffer. For example, the memory
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* region is corrupted after suspend on some machines. Dynamically
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* loaded tables are usually small, so this overhead is minimal.
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*
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* The latest implementation (5/2009) does not use a mapping at all.
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* We use the low-level operation region interface to read the table
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* instead of the obvious optimization of using a direct mapping.
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* This maintains a consistent use of operation regions across the
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* entire subsystem. This is important if additional processing must
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* be performed in the (possibly user-installed) operation region
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* handler. For example, acpi_exec and ASLTS depend on this.
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*/
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/* Allocate a buffer for the table */
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table = ACPI_ALLOCATE(length);
|
|
if (!table) {
|
|
return_ACPI_STATUS(AE_NO_MEMORY);
|
|
}
|
|
|
|
/* Read the entire table */
|
|
|
|
status = acpi_ex_region_read(obj_desc, length,
|
|
ACPI_CAST_PTR(u8, table));
|
|
if (ACPI_FAILURE(status)) {
|
|
ACPI_FREE(table);
|
|
return_ACPI_STATUS(status);
|
|
}
|
|
break;
|
|
|
|
case ACPI_TYPE_BUFFER: /* Buffer or resolved region_field */
|
|
|
|
ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
|
|
"Load table from Buffer or Field %p\n",
|
|
obj_desc));
|
|
|
|
/* Must have at least an ACPI table header */
|
|
|
|
if (obj_desc->buffer.length < sizeof(struct acpi_table_header)) {
|
|
return_ACPI_STATUS(AE_INVALID_TABLE_LENGTH);
|
|
}
|
|
|
|
/* Get the actual table length from the table header */
|
|
|
|
table_header =
|
|
ACPI_CAST_PTR(struct acpi_table_header,
|
|
obj_desc->buffer.pointer);
|
|
length = table_header->length;
|
|
|
|
/* Table cannot extend beyond the buffer */
|
|
|
|
if (length > obj_desc->buffer.length) {
|
|
return_ACPI_STATUS(AE_AML_BUFFER_LIMIT);
|
|
}
|
|
if (length < sizeof(struct acpi_table_header)) {
|
|
return_ACPI_STATUS(AE_INVALID_TABLE_LENGTH);
|
|
}
|
|
|
|
/*
|
|
* Copy the table from the buffer because the buffer could be
|
|
* modified or even deleted in the future
|
|
*/
|
|
table = ACPI_ALLOCATE(length);
|
|
if (!table) {
|
|
return_ACPI_STATUS(AE_NO_MEMORY);
|
|
}
|
|
|
|
memcpy(table, table_header, length);
|
|
break;
|
|
|
|
default:
|
|
|
|
return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
|
|
}
|
|
|
|
/* Install the new table into the local data structures */
|
|
|
|
ACPI_INFO(("Dynamic OEM Table Load:"));
|
|
(void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
|
|
|
|
status = acpi_tb_install_standard_table(ACPI_PTR_TO_PHYSADDR(table),
|
|
ACPI_TABLE_ORIGIN_INTERNAL_VIRTUAL,
|
|
TRUE, TRUE, &table_index);
|
|
|
|
(void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
|
|
if (ACPI_FAILURE(status)) {
|
|
|
|
/* Delete allocated table buffer */
|
|
|
|
ACPI_FREE(table);
|
|
return_ACPI_STATUS(status);
|
|
}
|
|
|
|
/*
|
|
* Note: Now table is "INSTALLED", it must be validated before
|
|
* loading.
|
|
*/
|
|
status =
|
|
acpi_tb_validate_table(&acpi_gbl_root_table_list.
|
|
tables[table_index]);
|
|
if (ACPI_FAILURE(status)) {
|
|
return_ACPI_STATUS(status);
|
|
}
|
|
|
|
/*
|
|
* Add the table to the namespace.
|
|
*
|
|
* Note: Load the table objects relative to the root of the namespace.
|
|
* This appears to go against the ACPI specification, but we do it for
|
|
* compatibility with other ACPI implementations.
|
|
*/
|
|
status =
|
|
acpi_ex_add_table(table_index, acpi_gbl_root_node, &ddb_handle);
|
|
if (ACPI_FAILURE(status)) {
|
|
|
|
/* On error, table_ptr was deallocated above */
|
|
|
|
return_ACPI_STATUS(status);
|
|
}
|
|
|
|
/* Store the ddb_handle into the Target operand */
|
|
|
|
status = acpi_ex_store(ddb_handle, target, walk_state);
|
|
if (ACPI_FAILURE(status)) {
|
|
(void)acpi_ex_unload_table(ddb_handle);
|
|
|
|
/* table_ptr was deallocated above */
|
|
|
|
acpi_ut_remove_reference(ddb_handle);
|
|
return_ACPI_STATUS(status);
|
|
}
|
|
|
|
/* Remove the reference by added by acpi_ex_store above */
|
|
|
|
acpi_ut_remove_reference(ddb_handle);
|
|
|
|
/* 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);
|
|
}
|
|
|
|
return_ACPI_STATUS(status);
|
|
}
|
|
|
|
/*******************************************************************************
|
|
*
|
|
* FUNCTION: acpi_ex_unload_table
|
|
*
|
|
* PARAMETERS: ddb_handle - Handle to a previously loaded table
|
|
*
|
|
* RETURN: Status
|
|
*
|
|
* DESCRIPTION: Unload an ACPI table
|
|
*
|
|
******************************************************************************/
|
|
|
|
acpi_status acpi_ex_unload_table(union acpi_operand_object *ddb_handle)
|
|
{
|
|
acpi_status status = AE_OK;
|
|
union acpi_operand_object *table_desc = ddb_handle;
|
|
u32 table_index;
|
|
struct acpi_table_header *table;
|
|
|
|
ACPI_FUNCTION_TRACE(ex_unload_table);
|
|
|
|
/*
|
|
* Temporarily emit a warning so that the ASL for the machine can be
|
|
* hopefully obtained. This is to say that the Unload() operator is
|
|
* extremely rare if not completely unused.
|
|
*/
|
|
ACPI_WARNING((AE_INFO, "Received request to unload an ACPI table"));
|
|
|
|
/*
|
|
* Validate the handle
|
|
* Although the handle is partially validated in acpi_ex_reconfiguration()
|
|
* when it calls acpi_ex_resolve_operands(), the handle is more completely
|
|
* validated here.
|
|
*
|
|
* Handle must be a valid operand object of type reference. Also, the
|
|
* ddb_handle must still be marked valid (table has not been previously
|
|
* unloaded)
|
|
*/
|
|
if ((!ddb_handle) ||
|
|
(ACPI_GET_DESCRIPTOR_TYPE(ddb_handle) != ACPI_DESC_TYPE_OPERAND) ||
|
|
(ddb_handle->common.type != ACPI_TYPE_LOCAL_REFERENCE) ||
|
|
(!(ddb_handle->common.flags & AOPOBJ_DATA_VALID))) {
|
|
return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
|
|
}
|
|
|
|
/* Get the table index from the ddb_handle */
|
|
|
|
table_index = table_desc->reference.value;
|
|
|
|
/* Ensure the table is still loaded */
|
|
|
|
if (!acpi_tb_is_table_loaded(table_index)) {
|
|
return_ACPI_STATUS(AE_NOT_EXIST);
|
|
}
|
|
|
|
/* Invoke table handler if present */
|
|
|
|
if (acpi_gbl_table_handler) {
|
|
status = acpi_get_table_by_index(table_index, &table);
|
|
if (ACPI_SUCCESS(status)) {
|
|
(void)acpi_gbl_table_handler(ACPI_TABLE_EVENT_UNLOAD,
|
|
table,
|
|
acpi_gbl_table_handler_context);
|
|
}
|
|
}
|
|
|
|
/* Delete the portion of the namespace owned by this table */
|
|
|
|
status = acpi_tb_delete_namespace_by_owner(table_index);
|
|
if (ACPI_FAILURE(status)) {
|
|
return_ACPI_STATUS(status);
|
|
}
|
|
|
|
(void)acpi_tb_release_owner_id(table_index);
|
|
acpi_tb_set_table_loaded_flag(table_index, FALSE);
|
|
|
|
/*
|
|
* Invalidate the handle. We do this because the handle may be stored
|
|
* in a named object and may not be actually deleted until much later.
|
|
*/
|
|
ddb_handle->common.flags &= ~AOPOBJ_DATA_VALID;
|
|
return_ACPI_STATUS(AE_OK);
|
|
}
|