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842 lines
25 KiB
842 lines
25 KiB
// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 |
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/****************************************************************************** |
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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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* Copyright (C) 2000 - 2021, Intel Corp. |
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* |
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*****************************************************************************/ |
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|
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#include <acpi/acpi.h> |
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#include "accommon.h" |
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#include "acdispat.h" |
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#include "acinterp.h" |
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#include "acnamesp.h" |
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#include "acparser.h" |
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#include "amlcode.h" |
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#include "acdebug.h" |
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#define _COMPONENT ACPI_DISPATCHER |
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ACPI_MODULE_NAME("dsmethod") |
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|
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/* Local prototypes */ |
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static acpi_status |
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acpi_ds_detect_named_opcodes(struct acpi_walk_state *walk_state, |
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union acpi_parse_object **out_op); |
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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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/******************************************************************************* |
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* |
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* FUNCTION: acpi_ds_auto_serialize_method |
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* |
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* PARAMETERS: node - Namespace Node of the method |
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* obj_desc - Method object attached to node |
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* |
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* RETURN: Status |
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* |
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* DESCRIPTION: Parse a control method AML to scan for control methods that |
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* need serialization due to the creation of named objects. |
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* |
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* NOTE: It is a bit of overkill to mark all such methods serialized, since |
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* there is only a problem if the method actually blocks during execution. |
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* A blocking operation is, for example, a Sleep() operation, or any access |
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* to an operation region. However, it is probably not possible to easily |
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* detect whether a method will block or not, so we simply mark all suspicious |
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* methods as serialized. |
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* |
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* NOTE2: This code is essentially a generic routine for parsing a single |
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* control method. |
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* |
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******************************************************************************/ |
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acpi_status |
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acpi_ds_auto_serialize_method(struct acpi_namespace_node *node, |
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union acpi_operand_object *obj_desc) |
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{ |
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acpi_status status; |
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union acpi_parse_object *op = NULL; |
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struct acpi_walk_state *walk_state; |
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ACPI_FUNCTION_TRACE_PTR(ds_auto_serialize_method, node); |
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ACPI_DEBUG_PRINT((ACPI_DB_PARSE, |
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"Method auto-serialization parse [%4.4s] %p\n", |
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acpi_ut_get_node_name(node), node)); |
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/* Create/Init a root op for the method parse tree */ |
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op = acpi_ps_alloc_op(AML_METHOD_OP, obj_desc->method.aml_start); |
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if (!op) { |
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return_ACPI_STATUS(AE_NO_MEMORY); |
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} |
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acpi_ps_set_name(op, node->name.integer); |
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op->common.node = node; |
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/* Create and initialize a new walk state */ |
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walk_state = |
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acpi_ds_create_walk_state(node->owner_id, NULL, NULL, NULL); |
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if (!walk_state) { |
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acpi_ps_free_op(op); |
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return_ACPI_STATUS(AE_NO_MEMORY); |
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} |
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status = acpi_ds_init_aml_walk(walk_state, op, node, |
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obj_desc->method.aml_start, |
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obj_desc->method.aml_length, NULL, 0); |
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if (ACPI_FAILURE(status)) { |
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acpi_ds_delete_walk_state(walk_state); |
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acpi_ps_free_op(op); |
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return_ACPI_STATUS(status); |
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} |
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walk_state->descending_callback = acpi_ds_detect_named_opcodes; |
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/* Parse the method, scan for creation of named objects */ |
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status = acpi_ps_parse_aml(walk_state); |
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acpi_ps_delete_parse_tree(op); |
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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_detect_named_opcodes |
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* |
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* PARAMETERS: walk_state - Current state of the parse tree walk |
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* out_op - Unused, required for parser interface |
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* |
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* RETURN: Status |
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* |
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* DESCRIPTION: Descending callback used during the loading of ACPI tables. |
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* Currently used to detect methods that must be marked serialized |
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* in order to avoid problems with the creation of named objects. |
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* |
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******************************************************************************/ |
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static acpi_status |
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acpi_ds_detect_named_opcodes(struct acpi_walk_state *walk_state, |
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union acpi_parse_object **out_op) |
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{ |
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ACPI_FUNCTION_NAME(acpi_ds_detect_named_opcodes); |
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|
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/* We are only interested in opcodes that create a new name */ |
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if (! |
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(walk_state->op_info-> |
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flags & (AML_NAMED | AML_CREATE | AML_FIELD))) { |
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return (AE_OK); |
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} |
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/* |
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* At this point, we know we have a Named object opcode. |
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* Mark the method as serialized. Later code will create a mutex for |
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* this method to enforce serialization. |
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* |
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* Note, ACPI_METHOD_IGNORE_SYNC_LEVEL flag means that we will ignore the |
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* Sync Level mechanism for this method, even though it is now serialized. |
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* Otherwise, there can be conflicts with existing ASL code that actually |
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* uses sync levels. |
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*/ |
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walk_state->method_desc->method.sync_level = 0; |
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walk_state->method_desc->method.info_flags |= |
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(ACPI_METHOD_SERIALIZED | ACPI_METHOD_IGNORE_SYNC_LEVEL); |
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ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
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"Method serialized [%4.4s] %p - [%s] (%4.4X)\n", |
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walk_state->method_node->name.ascii, |
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walk_state->method_node, walk_state->op_info->name, |
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walk_state->opcode)); |
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/* Abort the parse, no need to examine this method any further */ |
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return (AE_CTRL_TERMINATE); |
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} |
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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 debugger 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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u32 aml_offset; |
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acpi_name name = 0; |
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|
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ACPI_FUNCTION_ENTRY(); |
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|
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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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aml_offset = (u32)ACPI_PTR_DIFF(walk_state->aml, |
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walk_state->parser_state. |
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aml_start); |
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if (walk_state->method_node) { |
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name = walk_state->method_node->name.integer; |
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} else if (walk_state->deferred_node) { |
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name = walk_state->deferred_node->name.integer; |
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} |
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status = acpi_gbl_exception_handler(status, name, |
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walk_state->opcode, |
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aml_offset, NULL); |
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acpi_ex_enter_interpreter(); |
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} |
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acpi_ds_clear_implicit_return(walk_state); |
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if (ACPI_FAILURE(status)) { |
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acpi_ds_dump_method_stack(status, walk_state, walk_state->op); |
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/* Display method locals/args if debugger is present */ |
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#ifdef ACPI_DEBUGGER |
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acpi_db_dump_method_info(status, walk_state); |
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#endif |
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} |
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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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acpi_ut_delete_object_desc(mutex_desc); |
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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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* |
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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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acpi_ex_start_trace_method(method_node, obj_desc, walk_state); |
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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.info_flags & ACPI_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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* If the method was auto-serialized, we just ignore the sync level |
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* mechanism, because auto-serialization of methods can interfere |
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* with ASL code that actually uses sync levels. |
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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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(!(obj_desc->method. |
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info_flags & ACPI_METHOD_IGNORE_SYNC_LEVEL)) |
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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]" |
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", current SyncLevel is too large (%u)", |
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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.thread_id || |
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(walk_state->thread->thread_id != |
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obj_desc->method.mutex->mutex.thread_id)) { |
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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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|
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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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|
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obj_desc->method.mutex->mutex.thread_id = |
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walk_state->thread->thread_id; |
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|
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/* |
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* Update the current sync_level only if this is not an auto- |
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* serialized method. In the auto case, we have to ignore |
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* the sync level for the method mutex (created for the |
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* auto-serialization) because we have no idea of what the |
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* sync level should be. Therefore, just ignore it. |
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*/ |
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if (!(obj_desc->method.info_flags & |
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ACPI_METHOD_IGNORE_SYNC_LEVEL)) { |
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walk_state->thread->current_sync_level = |
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obj_desc->method.sync_level; |
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} |
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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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obj_desc->method.mutex->mutex.thread_id = |
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acpi_os_get_thread_id(); |
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} |
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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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/* |
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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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acpi_method_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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* |
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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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/* |
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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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|
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/* Init for new method, possibly wait on method mutex */ |
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status = |
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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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|
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next_walk_state = |
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acpi_ds_create_walk_state(obj_desc->method.owner_id, NULL, obj_desc, |
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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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/* |
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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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/* |
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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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status = AE_NO_MEMORY; |
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goto cleanup; |
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} |
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|
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info->parameters = &this_walk_state->operands[0]; |
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|
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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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|
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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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next_walk_state->method_nesting_depth = |
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this_walk_state->method_nesting_depth + 1; |
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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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|
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/* Clear the operand stack */ |
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this_walk_state->num_operands = 0; |
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|
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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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|
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this_walk_state->method_pathname = |
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acpi_ns_get_normalized_pathname(method_node, TRUE); |
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this_walk_state->method_is_nested = TRUE; |
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|
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/* Optional object evaluation log */ |
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|
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ACPI_DEBUG_PRINT_RAW((ACPI_DB_EVALUATION, |
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"%-26s: %*s%s\n", " Nested method call", |
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next_walk_state->method_nesting_depth * 3, " ", |
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&this_walk_state->method_pathname[1])); |
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|
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/* Invoke an internal method if necessary */ |
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|
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if (obj_desc->method.info_flags & ACPI_METHOD_INTERNAL_ONLY) { |
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status = |
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obj_desc->method.dispatch.implementation(next_walk_state); |
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if (status == AE_OK) { |
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status = AE_CTRL_TERMINATE; |
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} |
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} |
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|
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return_ACPI_STATUS(status); |
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|
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cleanup: |
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|
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/* On error, we must terminate the method properly */ |
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|
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acpi_ds_terminate_control_method(obj_desc, 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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* |
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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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|
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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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|
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ACPI_FUNCTION_TRACE_PTR(ds_restart_control_method, walk_state); |
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|
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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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|
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/* Did the called method return a value? */ |
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|
|
if (return_desc) { |
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|
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/* Is the implicit return object the same as the return desc? */ |
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|
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same_as_implicit_return = |
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(walk_state->implicit_return_obj == return_desc); |
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|
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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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|
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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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} |
|
|
|
/* |
|
* Save as THIS method's return value in case it is returned |
|
* immediately to yet another method |
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*/ |
|
walk_state->return_desc = return_desc; |
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} |
|
|
|
/* |
|
* The following code is the optional support for the so-called |
|
* "implicit return". Some AML code assumes that the last value of the |
|
* method is "implicitly" returned to the caller, in the absence of an |
|
* explicit return value. |
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* |
|
* Just save the last result of the method as the return value. |
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* |
|
* NOTE: this is optional because the ASL language does not actually |
|
* support this behavior. |
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*/ |
|
else if (!acpi_ds_do_implicit_return |
|
(return_desc, walk_state, FALSE) |
|
|| same_as_implicit_return) { |
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/* |
|
* Delete the return value if it will not be used by the |
|
* 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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*/ |
|
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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* |
|
* FUNCTION: acpi_ds_terminate_control_method |
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* |
|
* PARAMETERS: method_desc - Method object |
|
* walk_state - State associated with the method |
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* |
|
* RETURN: None |
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* |
|
* DESCRIPTION: Terminate a control method. Delete everything that the method |
|
* created, delete all locals and arguments, and delete the parse |
|
* tree if requested. |
|
* |
|
* MUTEX: Interpreter is locked |
|
* |
|
******************************************************************************/ |
|
|
|
void |
|
acpi_ds_terminate_control_method(union acpi_operand_object *method_desc, |
|
struct acpi_walk_state *walk_state) |
|
{ |
|
|
|
ACPI_FUNCTION_TRACE_PTR(ds_terminate_control_method, walk_state); |
|
|
|
/* method_desc is required, walk_state is optional */ |
|
|
|
if (!method_desc) { |
|
return_VOID; |
|
} |
|
|
|
if (walk_state) { |
|
|
|
/* Delete all arguments and locals */ |
|
|
|
acpi_ds_method_data_delete_all(walk_state); |
|
|
|
/* |
|
* Delete any namespace objects created anywhere within the |
|
* namespace by the execution of this method. Unless: |
|
* 1) This method is a module-level executable code method, in which |
|
* case we want make the objects permanent. |
|
* 2) There are other threads executing the method, in which case we |
|
* will wait until the last thread has completed. |
|
*/ |
|
if (!(method_desc->method.info_flags & ACPI_METHOD_MODULE_LEVEL) |
|
&& (method_desc->method.thread_count == 1)) { |
|
|
|
/* Delete any direct children of (created by) this method */ |
|
|
|
(void)acpi_ex_exit_interpreter(); |
|
acpi_ns_delete_namespace_subtree(walk_state-> |
|
method_node); |
|
(void)acpi_ex_enter_interpreter(); |
|
|
|
/* |
|
* Delete any objects that were created by this method |
|
* elsewhere in the namespace (if any were created). |
|
* Use of the ACPI_METHOD_MODIFIED_NAMESPACE optimizes the |
|
* deletion such that we don't have to perform an entire |
|
* namespace walk for every control method execution. |
|
*/ |
|
if (method_desc->method. |
|
info_flags & ACPI_METHOD_MODIFIED_NAMESPACE) { |
|
(void)acpi_ex_exit_interpreter(); |
|
acpi_ns_delete_namespace_by_owner(method_desc-> |
|
method. |
|
owner_id); |
|
(void)acpi_ex_enter_interpreter(); |
|
method_desc->method.info_flags &= |
|
~ACPI_METHOD_MODIFIED_NAMESPACE; |
|
} |
|
} |
|
|
|
/* |
|
* If method is serialized, release the mutex and restore the |
|
* current sync level for this thread |
|
*/ |
|
if (method_desc->method.mutex) { |
|
|
|
/* Acquisition Depth handles recursive calls */ |
|
|
|
method_desc->method.mutex->mutex.acquisition_depth--; |
|
if (!method_desc->method.mutex->mutex.acquisition_depth) { |
|
walk_state->thread->current_sync_level = |
|
method_desc->method.mutex->mutex. |
|
original_sync_level; |
|
|
|
acpi_os_release_mutex(method_desc->method. |
|
mutex->mutex.os_mutex); |
|
method_desc->method.mutex->mutex.thread_id = 0; |
|
} |
|
} |
|
} |
|
|
|
/* Decrement the thread count on the method */ |
|
|
|
if (method_desc->method.thread_count) { |
|
method_desc->method.thread_count--; |
|
} else { |
|
ACPI_ERROR((AE_INFO, "Invalid zero thread count in method")); |
|
} |
|
|
|
/* Are there any other threads currently executing this method? */ |
|
|
|
if (method_desc->method.thread_count) { |
|
/* |
|
* Additional threads. Do not release the owner_id in this case, |
|
* we immediately reuse it for the next thread executing this method |
|
*/ |
|
ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, |
|
"*** Completed execution of one thread, %u threads remaining\n", |
|
method_desc->method.thread_count)); |
|
} else { |
|
/* This is the only executing thread for this method */ |
|
|
|
/* |
|
* Support to dynamically change a method from not_serialized to |
|
* Serialized if it appears that the method is incorrectly written and |
|
* does not support multiple thread execution. The best example of this |
|
* is if such a method creates namespace objects and blocks. A second |
|
* thread will fail with an AE_ALREADY_EXISTS exception. |
|
* |
|
* This code is here because we must wait until the last thread exits |
|
* before marking the method as serialized. |
|
*/ |
|
if (method_desc->method. |
|
info_flags & ACPI_METHOD_SERIALIZED_PENDING) { |
|
if (walk_state) { |
|
ACPI_INFO(("Marking method %4.4s as Serialized " |
|
"because of AE_ALREADY_EXISTS error", |
|
walk_state->method_node->name. |
|
ascii)); |
|
} |
|
|
|
/* |
|
* Method tried to create an object twice and was marked as |
|
* "pending serialized". The probable cause is that the method |
|
* cannot handle reentrancy. |
|
* |
|
* The method was created as not_serialized, but it tried to create |
|
* a named object and then blocked, causing the second thread |
|
* entrance to begin and then fail. Workaround this problem by |
|
* marking the method permanently as Serialized when the last |
|
* thread exits here. |
|
*/ |
|
method_desc->method.info_flags &= |
|
~ACPI_METHOD_SERIALIZED_PENDING; |
|
|
|
method_desc->method.info_flags |= |
|
(ACPI_METHOD_SERIALIZED | |
|
ACPI_METHOD_IGNORE_SYNC_LEVEL); |
|
method_desc->method.sync_level = 0; |
|
} |
|
|
|
/* No more threads, we can free the owner_id */ |
|
|
|
if (! |
|
(method_desc->method. |
|
info_flags & ACPI_METHOD_MODULE_LEVEL)) { |
|
acpi_ut_release_owner_id(&method_desc->method.owner_id); |
|
} |
|
} |
|
|
|
acpi_ex_stop_trace_method((struct acpi_namespace_node *)method_desc-> |
|
method.node, method_desc, walk_state); |
|
|
|
return_VOID; |
|
}
|
|
|