| // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 |
| /****************************************************************************** |
| * |
| * Module Name: dsmethod - Parser/Interpreter interface - control method parsing |
| * |
| * Copyright (C) 2000 - 2022, Intel Corp. |
| * |
| *****************************************************************************/ |
| |
| #include <acpi/acpi.h> |
| #include "accommon.h" |
| #include "acdispat.h" |
| #include "acinterp.h" |
| #include "acnamesp.h" |
| #include "acparser.h" |
| #include "amlcode.h" |
| #include "acdebug.h" |
| |
| #define _COMPONENT ACPI_DISPATCHER |
| ACPI_MODULE_NAME("dsmethod") |
| |
| /* Local prototypes */ |
| static acpi_status |
| acpi_ds_detect_named_opcodes(struct acpi_walk_state *walk_state, |
| union acpi_parse_object **out_op); |
| |
| static acpi_status |
| acpi_ds_create_method_mutex(union acpi_operand_object *method_desc); |
| |
| /******************************************************************************* |
| * |
| * FUNCTION: acpi_ds_auto_serialize_method |
| * |
| * PARAMETERS: node - Namespace Node of the method |
| * obj_desc - Method object attached to node |
| * |
| * RETURN: Status |
| * |
| * DESCRIPTION: Parse a control method AML to scan for control methods that |
| * need serialization due to the creation of named objects. |
| * |
| * NOTE: It is a bit of overkill to mark all such methods serialized, since |
| * there is only a problem if the method actually blocks during execution. |
| * A blocking operation is, for example, a Sleep() operation, or any access |
| * to an operation region. However, it is probably not possible to easily |
| * detect whether a method will block or not, so we simply mark all suspicious |
| * methods as serialized. |
| * |
| * NOTE2: This code is essentially a generic routine for parsing a single |
| * control method. |
| * |
| ******************************************************************************/ |
| |
| acpi_status |
| acpi_ds_auto_serialize_method(struct acpi_namespace_node *node, |
| union acpi_operand_object *obj_desc) |
| { |
| acpi_status status; |
| union acpi_parse_object *op = NULL; |
| struct acpi_walk_state *walk_state; |
| |
| ACPI_FUNCTION_TRACE_PTR(ds_auto_serialize_method, node); |
| |
| ACPI_DEBUG_PRINT((ACPI_DB_PARSE, |
| "Method auto-serialization parse [%4.4s] %p\n", |
| acpi_ut_get_node_name(node), node)); |
| |
| /* Create/Init a root op for the method parse tree */ |
| |
| op = acpi_ps_alloc_op(AML_METHOD_OP, obj_desc->method.aml_start); |
| if (!op) { |
| return_ACPI_STATUS(AE_NO_MEMORY); |
| } |
| |
| acpi_ps_set_name(op, node->name.integer); |
| op->common.node = node; |
| |
| /* Create and initialize a new walk state */ |
| |
| walk_state = |
| acpi_ds_create_walk_state(node->owner_id, NULL, NULL, NULL); |
| if (!walk_state) { |
| acpi_ps_free_op(op); |
| return_ACPI_STATUS(AE_NO_MEMORY); |
| } |
| |
| status = acpi_ds_init_aml_walk(walk_state, op, node, |
| obj_desc->method.aml_start, |
| obj_desc->method.aml_length, NULL, 0); |
| if (ACPI_FAILURE(status)) { |
| acpi_ds_delete_walk_state(walk_state); |
| acpi_ps_free_op(op); |
| return_ACPI_STATUS(status); |
| } |
| |
| walk_state->descending_callback = acpi_ds_detect_named_opcodes; |
| |
| /* Parse the method, scan for creation of named objects */ |
| |
| status = acpi_ps_parse_aml(walk_state); |
| |
| acpi_ps_delete_parse_tree(op); |
| return_ACPI_STATUS(status); |
| } |
| |
| /******************************************************************************* |
| * |
| * FUNCTION: acpi_ds_detect_named_opcodes |
| * |
| * PARAMETERS: walk_state - Current state of the parse tree walk |
| * out_op - Unused, required for parser interface |
| * |
| * RETURN: Status |
| * |
| * DESCRIPTION: Descending callback used during the loading of ACPI tables. |
| * Currently used to detect methods that must be marked serialized |
| * in order to avoid problems with the creation of named objects. |
| * |
| ******************************************************************************/ |
| |
| static acpi_status |
| acpi_ds_detect_named_opcodes(struct acpi_walk_state *walk_state, |
| union acpi_parse_object **out_op) |
| { |
| |
| ACPI_FUNCTION_NAME(acpi_ds_detect_named_opcodes); |
| |
| /* We are only interested in opcodes that create a new name */ |
| |
| if (! |
| (walk_state->op_info-> |
| flags & (AML_NAMED | AML_CREATE | AML_FIELD))) { |
| return (AE_OK); |
| } |
| |
| /* |
| * At this point, we know we have a Named object opcode. |
| * Mark the method as serialized. Later code will create a mutex for |
| * this method to enforce serialization. |
| * |
| * Note, ACPI_METHOD_IGNORE_SYNC_LEVEL flag means that we will ignore the |
| * Sync Level mechanism for this method, even though it is now serialized. |
| * Otherwise, there can be conflicts with existing ASL code that actually |
| * uses sync levels. |
| */ |
| walk_state->method_desc->method.sync_level = 0; |
| walk_state->method_desc->method.info_flags |= |
| (ACPI_METHOD_SERIALIZED | ACPI_METHOD_IGNORE_SYNC_LEVEL); |
| |
| ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
| "Method serialized [%4.4s] %p - [%s] (%4.4X)\n", |
| walk_state->method_node->name.ascii, |
| walk_state->method_node, walk_state->op_info->name, |
| walk_state->opcode)); |
| |
| /* Abort the parse, no need to examine this method any further */ |
| |
| return (AE_CTRL_TERMINATE); |
| } |
| |
| /******************************************************************************* |
| * |
| * FUNCTION: acpi_ds_method_error |
| * |
| * PARAMETERS: status - Execution status |
| * walk_state - Current state |
| * |
| * RETURN: Status |
| * |
| * DESCRIPTION: Called on method error. Invoke the global exception handler if |
| * present, dump the method data if the debugger is configured |
| * |
| * Note: Allows the exception handler to change the status code |
| * |
| ******************************************************************************/ |
| |
| acpi_status |
| acpi_ds_method_error(acpi_status status, struct acpi_walk_state *walk_state) |
| { |
| u32 aml_offset; |
| acpi_name name = 0; |
| |
| ACPI_FUNCTION_ENTRY(); |
| |
| /* Ignore AE_OK and control exception codes */ |
| |
| if (ACPI_SUCCESS(status) || (status & AE_CODE_CONTROL)) { |
| return (status); |
| } |
| |
| /* Invoke the global exception handler */ |
| |
| if (acpi_gbl_exception_handler) { |
| |
| /* Exit the interpreter, allow handler to execute methods */ |
| |
| acpi_ex_exit_interpreter(); |
| |
| /* |
| * Handler can map the exception code to anything it wants, including |
| * AE_OK, in which case the executing method will not be aborted. |
| */ |
| aml_offset = (u32)ACPI_PTR_DIFF(walk_state->aml, |
| walk_state->parser_state. |
| aml_start); |
| |
| if (walk_state->method_node) { |
| name = walk_state->method_node->name.integer; |
| } else if (walk_state->deferred_node) { |
| name = walk_state->deferred_node->name.integer; |
| } |
| |
| status = acpi_gbl_exception_handler(status, name, |
| walk_state->opcode, |
| aml_offset, NULL); |
| acpi_ex_enter_interpreter(); |
| } |
| |
| acpi_ds_clear_implicit_return(walk_state); |
| |
| if (ACPI_FAILURE(status)) { |
| acpi_ds_dump_method_stack(status, walk_state, walk_state->op); |
| |
| /* Display method locals/args if debugger is present */ |
| |
| #ifdef ACPI_DEBUGGER |
| acpi_db_dump_method_info(status, walk_state); |
| #endif |
| } |
| |
| return (status); |
| } |
| |
| /******************************************************************************* |
| * |
| * FUNCTION: acpi_ds_create_method_mutex |
| * |
| * PARAMETERS: obj_desc - The method object |
| * |
| * RETURN: Status |
| * |
| * DESCRIPTION: Create a mutex object for a serialized control method |
| * |
| ******************************************************************************/ |
| |
| static acpi_status |
| acpi_ds_create_method_mutex(union acpi_operand_object *method_desc) |
| { |
| union acpi_operand_object *mutex_desc; |
| acpi_status status; |
| |
| ACPI_FUNCTION_TRACE(ds_create_method_mutex); |
| |
| /* Create the new mutex object */ |
| |
| mutex_desc = acpi_ut_create_internal_object(ACPI_TYPE_MUTEX); |
| if (!mutex_desc) { |
| return_ACPI_STATUS(AE_NO_MEMORY); |
| } |
| |
| /* Create the actual OS Mutex */ |
| |
| status = acpi_os_create_mutex(&mutex_desc->mutex.os_mutex); |
| if (ACPI_FAILURE(status)) { |
| acpi_ut_delete_object_desc(mutex_desc); |
| return_ACPI_STATUS(status); |
| } |
| |
| mutex_desc->mutex.sync_level = method_desc->method.sync_level; |
| method_desc->method.mutex = mutex_desc; |
| return_ACPI_STATUS(AE_OK); |
| } |
| |
| /******************************************************************************* |
| * |
| * FUNCTION: acpi_ds_begin_method_execution |
| * |
| * PARAMETERS: method_node - Node of the method |
| * obj_desc - The method object |
| * walk_state - current state, NULL if not yet executing |
| * a method. |
| * |
| * RETURN: Status |
| * |
| * DESCRIPTION: Prepare a method for execution. Parses the method if necessary, |
| * increments the thread count, and waits at the method semaphore |
| * for clearance to execute. |
| * |
| ******************************************************************************/ |
| |
| acpi_status |
| acpi_ds_begin_method_execution(struct acpi_namespace_node *method_node, |
| union acpi_operand_object *obj_desc, |
| struct acpi_walk_state *walk_state) |
| { |
| acpi_status status = AE_OK; |
| |
| ACPI_FUNCTION_TRACE_PTR(ds_begin_method_execution, method_node); |
| |
| if (!method_node) { |
| return_ACPI_STATUS(AE_NULL_ENTRY); |
| } |
| |
| acpi_ex_start_trace_method(method_node, obj_desc, walk_state); |
| |
| /* Prevent wraparound of thread count */ |
| |
| if (obj_desc->method.thread_count == ACPI_UINT8_MAX) { |
| ACPI_ERROR((AE_INFO, |
| "Method reached maximum reentrancy limit (255)")); |
| return_ACPI_STATUS(AE_AML_METHOD_LIMIT); |
| } |
| |
| /* |
| * If this method is serialized, we need to acquire the method mutex. |
| */ |
| if (obj_desc->method.info_flags & ACPI_METHOD_SERIALIZED) { |
| /* |
| * Create a mutex for the method if it is defined to be Serialized |
| * and a mutex has not already been created. We defer the mutex creation |
| * until a method is actually executed, to minimize the object count |
| */ |
| if (!obj_desc->method.mutex) { |
| status = acpi_ds_create_method_mutex(obj_desc); |
| if (ACPI_FAILURE(status)) { |
| return_ACPI_STATUS(status); |
| } |
| } |
| |
| /* |
| * The current_sync_level (per-thread) must be less than or equal to |
| * the sync level of the method. This mechanism provides some |
| * deadlock prevention. |
| * |
| * If the method was auto-serialized, we just ignore the sync level |
| * mechanism, because auto-serialization of methods can interfere |
| * with ASL code that actually uses sync levels. |
| * |
| * Top-level method invocation has no walk state at this point |
| */ |
| if (walk_state && |
| (!(obj_desc->method. |
| info_flags & ACPI_METHOD_IGNORE_SYNC_LEVEL)) |
| && (walk_state->thread->current_sync_level > |
| obj_desc->method.mutex->mutex.sync_level)) { |
| ACPI_ERROR((AE_INFO, |
| "Cannot acquire Mutex for method [%4.4s]" |
| ", current SyncLevel is too large (%u)", |
| acpi_ut_get_node_name(method_node), |
| walk_state->thread->current_sync_level)); |
| |
| return_ACPI_STATUS(AE_AML_MUTEX_ORDER); |
| } |
| |
| /* |
| * Obtain the method mutex if necessary. Do not acquire mutex for a |
| * recursive call. |
| */ |
| if (!walk_state || |
| !obj_desc->method.mutex->mutex.thread_id || |
| (walk_state->thread->thread_id != |
| obj_desc->method.mutex->mutex.thread_id)) { |
| /* |
| * Acquire the method mutex. This releases the interpreter if we |
| * block (and reacquires it before it returns) |
| */ |
| status = |
| acpi_ex_system_wait_mutex(obj_desc->method.mutex-> |
| mutex.os_mutex, |
| ACPI_WAIT_FOREVER); |
| if (ACPI_FAILURE(status)) { |
| return_ACPI_STATUS(status); |
| } |
| |
| /* Update the mutex and walk info and save the original sync_level */ |
| |
| if (walk_state) { |
| obj_desc->method.mutex->mutex. |
| original_sync_level = |
| walk_state->thread->current_sync_level; |
| |
| obj_desc->method.mutex->mutex.thread_id = |
| walk_state->thread->thread_id; |
| |
| /* |
| * Update the current sync_level only if this is not an auto- |
| * serialized method. In the auto case, we have to ignore |
| * the sync level for the method mutex (created for the |
| * auto-serialization) because we have no idea of what the |
| * sync level should be. Therefore, just ignore it. |
| */ |
| if (!(obj_desc->method.info_flags & |
| ACPI_METHOD_IGNORE_SYNC_LEVEL)) { |
| walk_state->thread->current_sync_level = |
| obj_desc->method.sync_level; |
| } |
| } else { |
| obj_desc->method.mutex->mutex. |
| original_sync_level = |
| obj_desc->method.mutex->mutex.sync_level; |
| |
| obj_desc->method.mutex->mutex.thread_id = |
| acpi_os_get_thread_id(); |
| } |
| } |
| |
| /* Always increase acquisition depth */ |
| |
| obj_desc->method.mutex->mutex.acquisition_depth++; |
| } |
| |
| /* |
| * Allocate an Owner ID for this method, only if this is the first thread |
| * to begin concurrent execution. We only need one owner_id, even if the |
| * method is invoked recursively. |
| */ |
| if (!obj_desc->method.owner_id) { |
| status = acpi_ut_allocate_owner_id(&obj_desc->method.owner_id); |
| if (ACPI_FAILURE(status)) { |
| goto cleanup; |
| } |
| } |
| |
| /* |
| * Increment the method parse tree thread count since it has been |
| * reentered one more time (even if it is the same thread) |
| */ |
| obj_desc->method.thread_count++; |
| acpi_method_count++; |
| return_ACPI_STATUS(status); |
| |
| cleanup: |
| /* On error, must release the method mutex (if present) */ |
| |
| if (obj_desc->method.mutex) { |
| acpi_os_release_mutex(obj_desc->method.mutex->mutex.os_mutex); |
| } |
| return_ACPI_STATUS(status); |
| } |
| |
| /******************************************************************************* |
| * |
| * FUNCTION: acpi_ds_call_control_method |
| * |
| * PARAMETERS: thread - Info for this thread |
| * this_walk_state - Current walk state |
| * op - Current Op to be walked |
| * |
| * RETURN: Status |
| * |
| * DESCRIPTION: Transfer execution to a called control method |
| * |
| ******************************************************************************/ |
| |
| acpi_status |
| acpi_ds_call_control_method(struct acpi_thread_state *thread, |
| struct acpi_walk_state *this_walk_state, |
| union acpi_parse_object *op) |
| { |
| acpi_status status; |
| struct acpi_namespace_node *method_node; |
| struct acpi_walk_state *next_walk_state = NULL; |
| union acpi_operand_object *obj_desc; |
| struct acpi_evaluate_info *info; |
| u32 i; |
| |
| ACPI_FUNCTION_TRACE_PTR(ds_call_control_method, this_walk_state); |
| |
| ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, |
| "Calling method %p, currentstate=%p\n", |
| this_walk_state->prev_op, this_walk_state)); |
| |
| /* |
| * Get the namespace entry for the control method we are about to call |
| */ |
| method_node = this_walk_state->method_call_node; |
| if (!method_node) { |
| return_ACPI_STATUS(AE_NULL_ENTRY); |
| } |
| |
| obj_desc = acpi_ns_get_attached_object(method_node); |
| if (!obj_desc) { |
| return_ACPI_STATUS(AE_NULL_OBJECT); |
| } |
| |
| /* Init for new method, possibly wait on method mutex */ |
| |
| status = |
| acpi_ds_begin_method_execution(method_node, obj_desc, |
| this_walk_state); |
| if (ACPI_FAILURE(status)) { |
| return_ACPI_STATUS(status); |
| } |
| |
| /* Begin method parse/execution. Create a new walk state */ |
| |
| next_walk_state = |
| acpi_ds_create_walk_state(obj_desc->method.owner_id, NULL, obj_desc, |
| thread); |
| if (!next_walk_state) { |
| status = AE_NO_MEMORY; |
| goto cleanup; |
| } |
| |
| /* |
| * The resolved arguments were put on the previous walk state's operand |
| * stack. Operands on the previous walk state stack always |
| * start at index 0. Also, null terminate the list of arguments |
| */ |
| this_walk_state->operands[this_walk_state->num_operands] = NULL; |
| |
| /* |
| * Allocate and initialize the evaluation information block |
| * TBD: this is somewhat inefficient, should change interface to |
| * ds_init_aml_walk. For now, keeps this struct off the CPU stack |
| */ |
| info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info)); |
| if (!info) { |
| status = AE_NO_MEMORY; |
| goto pop_walk_state; |
| } |
| |
| info->parameters = &this_walk_state->operands[0]; |
| |
| status = acpi_ds_init_aml_walk(next_walk_state, NULL, method_node, |
| obj_desc->method.aml_start, |
| obj_desc->method.aml_length, info, |
| ACPI_IMODE_EXECUTE); |
| |
| ACPI_FREE(info); |
| if (ACPI_FAILURE(status)) { |
| goto pop_walk_state; |
| } |
| |
| next_walk_state->method_nesting_depth = |
| this_walk_state->method_nesting_depth + 1; |
| |
| /* |
| * Delete the operands on the previous walkstate operand stack |
| * (they were copied to new objects) |
| */ |
| for (i = 0; i < obj_desc->method.param_count; i++) { |
| acpi_ut_remove_reference(this_walk_state->operands[i]); |
| this_walk_state->operands[i] = NULL; |
| } |
| |
| /* Clear the operand stack */ |
| |
| this_walk_state->num_operands = 0; |
| |
| ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, |
| "**** Begin nested execution of [%4.4s] **** WalkState=%p\n", |
| method_node->name.ascii, next_walk_state)); |
| |
| this_walk_state->method_pathname = |
| acpi_ns_get_normalized_pathname(method_node, TRUE); |
| this_walk_state->method_is_nested = TRUE; |
| |
| /* Optional object evaluation log */ |
| |
| ACPI_DEBUG_PRINT_RAW((ACPI_DB_EVALUATION, |
| "%-26s: %*s%s\n", " Nested method call", |
| next_walk_state->method_nesting_depth * 3, " ", |
| &this_walk_state->method_pathname[1])); |
| |
| /* Invoke an internal method if necessary */ |
| |
| if (obj_desc->method.info_flags & ACPI_METHOD_INTERNAL_ONLY) { |
| status = |
| obj_desc->method.dispatch.implementation(next_walk_state); |
| if (status == AE_OK) { |
| status = AE_CTRL_TERMINATE; |
| } |
| } |
| |
| return_ACPI_STATUS(status); |
| |
| pop_walk_state: |
| |
| /* On error, pop the walk state to be deleted from thread */ |
| |
| acpi_ds_pop_walk_state(thread); |
| |
| cleanup: |
| |
| /* On error, we must terminate the method properly */ |
| |
| acpi_ds_terminate_control_method(obj_desc, next_walk_state); |
| acpi_ds_delete_walk_state(next_walk_state); |
| |
| return_ACPI_STATUS(status); |
| } |
| |
| /******************************************************************************* |
| * |
| * FUNCTION: acpi_ds_restart_control_method |
| * |
| * PARAMETERS: walk_state - State for preempted method (caller) |
| * return_desc - Return value from the called method |
| * |
| * RETURN: Status |
| * |
| * DESCRIPTION: Restart a method that was preempted by another (nested) method |
| * invocation. Handle the return value (if any) from the callee. |
| * |
| ******************************************************************************/ |
| |
| acpi_status |
| acpi_ds_restart_control_method(struct acpi_walk_state *walk_state, |
| union acpi_operand_object *return_desc) |
| { |
| acpi_status status; |
| int same_as_implicit_return; |
| |
| ACPI_FUNCTION_TRACE_PTR(ds_restart_control_method, walk_state); |
| |
| ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, |
| "****Restart [%4.4s] Op %p ReturnValueFromCallee %p\n", |
| acpi_ut_get_node_name(walk_state->method_node), |
| walk_state->method_call_op, return_desc)); |
| |
| ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, |
| " ReturnFromThisMethodUsed?=%X ResStack %p Walk %p\n", |
| walk_state->return_used, |
| walk_state->results, walk_state)); |
| |
| /* Did the called method return a value? */ |
| |
| if (return_desc) { |
| |
| /* Is the implicit return object the same as the return desc? */ |
| |
| same_as_implicit_return = |
| (walk_state->implicit_return_obj == return_desc); |
| |
| /* Are we actually going to use the return value? */ |
| |
| if (walk_state->return_used) { |
| |
| /* Save the return value from the previous method */ |
| |
| status = acpi_ds_result_push(return_desc, walk_state); |
| if (ACPI_FAILURE(status)) { |
| acpi_ut_remove_reference(return_desc); |
| return_ACPI_STATUS(status); |
| } |
| |
| /* |
| * Save as THIS method's return value in case it is returned |
| * immediately to yet another method |
| */ |
| walk_state->return_desc = return_desc; |
| } |
| |
| /* |
| * 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. |
| * |
| * Just save the last result of the method as the return value. |
| * |
| * NOTE: this is optional because the ASL language does not actually |
| * support this behavior. |
| */ |
| else if (!acpi_ds_do_implicit_return |
| (return_desc, walk_state, FALSE) |
| || same_as_implicit_return) { |
| /* |
| * Delete the return value if it will not be used by the |
| * calling method or remove one reference if the explicit return |
| * is the same as the implicit return value. |
| */ |
| acpi_ut_remove_reference(return_desc); |
| } |
| } |
| |
| return_ACPI_STATUS(AE_OK); |
| } |
| |
| /******************************************************************************* |
| * |
| * FUNCTION: acpi_ds_terminate_control_method |
| * |
| * PARAMETERS: method_desc - Method object |
| * walk_state - State associated with the method |
| * |
| * RETURN: None |
| * |
| * 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; |
| } |