![Bob Moore](/assets/img/avatar_default.png)
Signed-off-by: Alexey Starikovskiy <alexey.y.starikovskiy@intel.com> Signed-off-by: Len Brown <len.brown@intel.com>
633 lines
19 KiB
C
633 lines
19 KiB
C
/******************************************************************************
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*
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* Module Name: dsmethod - Parser/Interpreter interface - control method parsing
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*
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*****************************************************************************/
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/*
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* Copyright (C) 2000 - 2006, R. Byron Moore
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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 <acpi/acparser.h>
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#include <acpi/amlcode.h>
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#include <acpi/acdispat.h>
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#include <acpi/acinterp.h>
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#include <acpi/acnamesp.h>
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#include <acpi/acdisasm.h>
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#define _COMPONENT ACPI_DISPATCHER
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ACPI_MODULE_NAME("dsmethod")
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/* Local prototypes */
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static acpi_status
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acpi_ds_create_method_mutex(union acpi_operand_object *method_desc);
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/*******************************************************************************
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*
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* FUNCTION: acpi_ds_method_error
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*
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* PARAMETERS: Status - Execution status
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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: Called on method error. Invoke the global exception handler if
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* present, dump the method data if the disassembler is configured
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*
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* Note: Allows the exception handler to change the status code
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*
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******************************************************************************/
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acpi_status
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acpi_ds_method_error(acpi_status status, struct acpi_walk_state *walk_state)
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{
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ACPI_FUNCTION_ENTRY();
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/* Ignore AE_OK and control exception codes */
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if (ACPI_SUCCESS(status) || (status & AE_CODE_CONTROL)) {
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return (status);
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}
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/* Invoke the global exception handler */
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if (acpi_gbl_exception_handler) {
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/* Exit the interpreter, allow handler to execute methods */
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acpi_ex_exit_interpreter();
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/*
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* Handler can map the exception code to anything it wants, including
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* AE_OK, in which case the executing method will not be aborted.
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*/
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status = acpi_gbl_exception_handler(status,
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walk_state->method_node ?
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walk_state->method_node->
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name.integer : 0,
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walk_state->opcode,
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walk_state->aml_offset,
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NULL);
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(void)acpi_ex_enter_interpreter();
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}
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#ifdef ACPI_DISASSEMBLER
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if (ACPI_FAILURE(status)) {
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/* Display method locals/args if disassembler is present */
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acpi_dm_dump_method_info(status, walk_state, walk_state->op);
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}
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#endif
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return (status);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ds_create_method_mutex
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*
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* PARAMETERS: obj_desc - The method object
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*
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* RETURN: Status
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*
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* DESCRIPTION: Create a mutex object for a serialized control method
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*
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******************************************************************************/
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static acpi_status
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acpi_ds_create_method_mutex(union acpi_operand_object *method_desc)
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{
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union acpi_operand_object *mutex_desc;
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acpi_status status;
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ACPI_FUNCTION_TRACE(ds_create_method_mutex);
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/* Create the new mutex object */
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mutex_desc = acpi_ut_create_internal_object(ACPI_TYPE_MUTEX);
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if (!mutex_desc) {
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return_ACPI_STATUS(AE_NO_MEMORY);
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}
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/* Create the actual OS Mutex */
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status = acpi_os_create_mutex(&mutex_desc->mutex.os_mutex);
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if (ACPI_FAILURE(status)) {
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return_ACPI_STATUS(status);
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}
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mutex_desc->mutex.sync_level = method_desc->method.sync_level;
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method_desc->method.mutex = mutex_desc;
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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_ds_begin_method_execution
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*
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* PARAMETERS: method_node - Node of the method
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* obj_desc - The method object
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* walk_state - current state, NULL if not yet executing
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* a method.
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*
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* RETURN: Status
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*
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* DESCRIPTION: Prepare a method for execution. Parses the method if necessary,
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* increments the thread count, and waits at the method semaphore
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* for clearance to execute.
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*
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******************************************************************************/
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acpi_status
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acpi_ds_begin_method_execution(struct acpi_namespace_node *method_node,
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union acpi_operand_object *obj_desc,
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struct acpi_walk_state *walk_state)
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{
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acpi_status status = AE_OK;
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ACPI_FUNCTION_TRACE_PTR(ds_begin_method_execution, method_node);
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if (!method_node) {
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return_ACPI_STATUS(AE_NULL_ENTRY);
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}
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/* Prevent wraparound of thread count */
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if (obj_desc->method.thread_count == ACPI_UINT8_MAX) {
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ACPI_ERROR((AE_INFO,
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"Method reached maximum reentrancy limit (255)"));
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return_ACPI_STATUS(AE_AML_METHOD_LIMIT);
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}
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/*
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* If this method is serialized, we need to acquire the method mutex.
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*/
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if (obj_desc->method.method_flags & AML_METHOD_SERIALIZED) {
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/*
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* Create a mutex for the method if it is defined to be Serialized
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* and a mutex has not already been created. We defer the mutex creation
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* until a method is actually executed, to minimize the object count
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*/
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if (!obj_desc->method.mutex) {
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status = acpi_ds_create_method_mutex(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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/*
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* The current_sync_level (per-thread) must be less than or equal to
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* the sync level of the method. This mechanism provides some
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* deadlock prevention
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*
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* Top-level method invocation has no walk state at this point
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*/
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if (walk_state &&
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(walk_state->thread->current_sync_level >
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obj_desc->method.mutex->mutex.sync_level)) {
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ACPI_ERROR((AE_INFO,
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"Cannot acquire Mutex for method [%4.4s], current SyncLevel is too large (%d)",
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acpi_ut_get_node_name(method_node),
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walk_state->thread->current_sync_level));
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return_ACPI_STATUS(AE_AML_MUTEX_ORDER);
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}
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/*
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* Obtain the method mutex if necessary. Do not acquire mutex for a
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* recursive call.
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*/
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if (!walk_state ||
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!obj_desc->method.mutex->mutex.owner_thread ||
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(walk_state->thread !=
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obj_desc->method.mutex->mutex.owner_thread)) {
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/*
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* Acquire the method mutex. This releases the interpreter if we
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* block (and reacquires it before it returns)
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*/
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status =
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acpi_ex_system_wait_mutex(obj_desc->method.mutex->
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mutex.os_mutex,
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ACPI_WAIT_FOREVER);
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if (ACPI_FAILURE(status)) {
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return_ACPI_STATUS(status);
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}
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/* Update the mutex and walk info and save the original sync_level */
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if (walk_state) {
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obj_desc->method.mutex->mutex.
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original_sync_level =
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walk_state->thread->current_sync_level;
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obj_desc->method.mutex->mutex.owner_thread =
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walk_state->thread;
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walk_state->thread->current_sync_level =
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obj_desc->method.sync_level;
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} else {
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obj_desc->method.mutex->mutex.
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original_sync_level =
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obj_desc->method.mutex->mutex.sync_level;
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}
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}
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/* Always increase acquisition depth */
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obj_desc->method.mutex->mutex.acquisition_depth++;
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}
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/*
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* Allocate an Owner ID for this method, only if this is the first thread
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* to begin concurrent execution. We only need one owner_id, even if the
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* method is invoked recursively.
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*/
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if (!obj_desc->method.owner_id) {
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status = acpi_ut_allocate_owner_id(&obj_desc->method.owner_id);
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if (ACPI_FAILURE(status)) {
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goto cleanup;
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}
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}
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/*
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* Increment the method parse tree thread count since it has been
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* reentered one more time (even if it is the same thread)
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*/
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obj_desc->method.thread_count++;
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return_ACPI_STATUS(status);
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cleanup:
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/* On error, must release the method mutex (if present) */
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if (obj_desc->method.mutex) {
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acpi_os_release_mutex(obj_desc->method.mutex->mutex.os_mutex);
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}
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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_ds_call_control_method
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*
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* PARAMETERS: Thread - Info for this thread
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* this_walk_state - Current walk state
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* Op - Current Op to be walked
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*
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* RETURN: Status
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*
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* DESCRIPTION: Transfer execution to a called control method
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*
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******************************************************************************/
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acpi_status
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acpi_ds_call_control_method(struct acpi_thread_state *thread,
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struct acpi_walk_state *this_walk_state,
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union acpi_parse_object *op)
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{
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acpi_status status;
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struct acpi_namespace_node *method_node;
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struct acpi_walk_state *next_walk_state = NULL;
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union acpi_operand_object *obj_desc;
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struct acpi_evaluate_info *info;
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u32 i;
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ACPI_FUNCTION_TRACE_PTR(ds_call_control_method, this_walk_state);
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ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
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"Calling method %p, currentstate=%p\n",
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this_walk_state->prev_op, this_walk_state));
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/*
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* Get the namespace entry for the control method we are about to call
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*/
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method_node = this_walk_state->method_call_node;
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if (!method_node) {
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return_ACPI_STATUS(AE_NULL_ENTRY);
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}
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obj_desc = acpi_ns_get_attached_object(method_node);
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if (!obj_desc) {
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return_ACPI_STATUS(AE_NULL_OBJECT);
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}
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/* Init for new method, possibly wait on method mutex */
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status = acpi_ds_begin_method_execution(method_node, obj_desc,
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this_walk_state);
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if (ACPI_FAILURE(status)) {
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return_ACPI_STATUS(status);
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}
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/* Begin method parse/execution. Create a new walk state */
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next_walk_state = acpi_ds_create_walk_state(obj_desc->method.owner_id,
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NULL, obj_desc, thread);
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if (!next_walk_state) {
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status = AE_NO_MEMORY;
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goto cleanup;
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}
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/*
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* The resolved arguments were put on the previous walk state's operand
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* stack. Operands on the previous walk state stack always
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* start at index 0. Also, null terminate the list of arguments
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*/
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this_walk_state->operands[this_walk_state->num_operands] = NULL;
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/*
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* Allocate and initialize the evaluation information block
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* TBD: this is somewhat inefficient, should change interface to
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* ds_init_aml_walk. For now, keeps this struct off the CPU stack
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*/
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info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info));
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if (!info) {
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return_ACPI_STATUS(AE_NO_MEMORY);
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}
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info->parameters = &this_walk_state->operands[0];
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info->parameter_type = ACPI_PARAM_ARGS;
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status = acpi_ds_init_aml_walk(next_walk_state, NULL, method_node,
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obj_desc->method.aml_start,
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obj_desc->method.aml_length, info,
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ACPI_IMODE_EXECUTE);
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ACPI_FREE(info);
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if (ACPI_FAILURE(status)) {
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goto cleanup;
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}
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/*
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* Delete the operands on the previous walkstate operand stack
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* (they were copied to new objects)
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*/
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for (i = 0; i < obj_desc->method.param_count; i++) {
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acpi_ut_remove_reference(this_walk_state->operands[i]);
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this_walk_state->operands[i] = NULL;
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}
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/* Clear the operand stack */
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this_walk_state->num_operands = 0;
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ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
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"**** Begin nested execution of [%4.4s] **** WalkState=%p\n",
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method_node->name.ascii, next_walk_state));
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/* Invoke an internal method if necessary */
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if (obj_desc->method.method_flags & AML_METHOD_INTERNAL_ONLY) {
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status = obj_desc->method.implementation(next_walk_state);
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}
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return_ACPI_STATUS(status);
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cleanup:
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/* On error, we must terminate the method properly */
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acpi_ds_terminate_control_method(obj_desc, next_walk_state);
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if (next_walk_state) {
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acpi_ds_delete_walk_state(next_walk_state);
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}
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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_ds_restart_control_method
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*
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* PARAMETERS: walk_state - State for preempted method (caller)
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* return_desc - Return value from the called method
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*
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* RETURN: Status
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*
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* DESCRIPTION: Restart a method that was preempted by another (nested) method
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* invocation. Handle the return value (if any) from the callee.
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*
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******************************************************************************/
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acpi_status
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acpi_ds_restart_control_method(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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int same_as_implicit_return;
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ACPI_FUNCTION_TRACE_PTR(ds_restart_control_method, walk_state);
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ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
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"****Restart [%4.4s] Op %p ReturnValueFromCallee %p\n",
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acpi_ut_get_node_name(walk_state->method_node),
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walk_state->method_call_op, return_desc));
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ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
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" ReturnFromThisMethodUsed?=%X ResStack %p Walk %p\n",
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walk_state->return_used,
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walk_state->results, walk_state));
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/* Did the called method return a value? */
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if (return_desc) {
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/* Is the implicit return object the same as the return desc? */
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same_as_implicit_return =
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(walk_state->implicit_return_obj == return_desc);
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/* Are we actually going to use the return value? */
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if (walk_state->return_used) {
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/* Save the return value from the previous method */
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status = acpi_ds_result_push(return_desc, walk_state);
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if (ACPI_FAILURE(status)) {
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acpi_ut_remove_reference(return_desc);
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return_ACPI_STATUS(status);
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}
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/*
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* Save as THIS method's return value in case it is returned
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* immediately to yet another method
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*/
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walk_state->return_desc = return_desc;
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}
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/*
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* The following code is the optional support for the so-called
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* "implicit return". Some AML code assumes that the last value of the
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* method is "implicitly" returned to the caller, in the absence of an
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* explicit return value.
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*
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* Just save the last result of the method as the return value.
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*
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* NOTE: this is optional because the ASL language does not actually
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* support this behavior.
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*/
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else if (!acpi_ds_do_implicit_return
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(return_desc, walk_state, FALSE)
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|| same_as_implicit_return) {
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/*
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* Delete the return value if it will not be used by the
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* calling method or remove one reference if the explicit return
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* is the same as the implicit return value.
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*/
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acpi_ut_remove_reference(return_desc);
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}
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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_ds_terminate_control_method
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*
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* PARAMETERS: method_desc - Method object
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* walk_state - State associated with the method
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*
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* RETURN: None
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*
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* DESCRIPTION: Terminate a control method. Delete everything that the method
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* created, delete all locals and arguments, and delete the parse
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* tree if requested.
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*
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* MUTEX: Interpreter is locked
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*
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******************************************************************************/
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void
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acpi_ds_terminate_control_method(union acpi_operand_object *method_desc,
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struct acpi_walk_state *walk_state)
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{
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struct acpi_namespace_node *method_node;
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acpi_status status;
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ACPI_FUNCTION_TRACE_PTR(ds_terminate_control_method, walk_state);
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/* method_desc is required, walk_state is optional */
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if (!method_desc) {
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return_VOID;
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}
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if (walk_state) {
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/* Delete all arguments and locals */
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acpi_ds_method_data_delete_all(walk_state);
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}
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/*
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* If method is serialized, release the mutex and restore the
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* current sync level for this thread
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*/
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if (method_desc->method.mutex) {
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/* Acquisition Depth handles recursive calls */
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method_desc->method.mutex->mutex.acquisition_depth--;
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if (!method_desc->method.mutex->mutex.acquisition_depth) {
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walk_state->thread->current_sync_level =
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method_desc->method.mutex->mutex.
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original_sync_level;
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acpi_os_release_mutex(method_desc->method.mutex->mutex.
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os_mutex);
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method_desc->method.mutex->mutex.owner_thread = NULL;
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}
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}
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if (walk_state) {
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/*
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* Delete any objects created by this method during execution.
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* The method Node is stored in the walk state
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*/
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method_node = walk_state->method_node;
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/*
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* Delete any namespace objects created anywhere within
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* the namespace by the execution of this method
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*/
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acpi_ns_delete_namespace_by_owner(method_desc->method.owner_id);
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}
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/* Decrement the thread count on the method */
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if (method_desc->method.thread_count) {
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method_desc->method.thread_count--;
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} else {
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ACPI_ERROR((AE_INFO, "Invalid zero thread count in method"));
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}
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/* Are there any other threads currently executing this method? */
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if (method_desc->method.thread_count) {
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/*
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* Additional threads. Do not release the owner_id in this case,
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* we immediately reuse it for the next thread executing this method
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*/
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ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
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"*** Completed execution of one thread, %d threads remaining\n",
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method_desc->method.thread_count));
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} else {
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/* This is the only executing thread for this method */
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/*
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* Support to dynamically change a method from not_serialized to
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* Serialized if it appears that the method is incorrectly written and
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* does not support multiple thread execution. The best example of this
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* is if such a method creates namespace objects and blocks. A second
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* thread will fail with an AE_ALREADY_EXISTS exception
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*
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* This code is here because we must wait until the last thread exits
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* before creating the synchronization semaphore.
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*/
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if ((method_desc->method.method_flags & AML_METHOD_SERIALIZED)
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&& (!method_desc->method.mutex)) {
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status = acpi_ds_create_method_mutex(method_desc);
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}
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/* No more threads, we can free the owner_id */
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acpi_ut_release_owner_id(&method_desc->method.owner_id);
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}
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return_VOID;
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}
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