| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Robert Moore | 1070 | 50.83% | 23 | 34.85% |
| Linus Torvalds (pre-git) | 299 | 14.20% | 3 | 4.55% |
| Lv Zheng | 205 | 9.74% | 12 | 18.18% |
| Len Brown | 168 | 7.98% | 8 | 12.12% |
| Linus Torvalds | 150 | 7.13% | 3 | 4.55% |
| Lin Ming | 108 | 5.13% | 4 | 6.06% |
| Andy Grover | 35 | 1.66% | 4 | 6.06% |
| Alexey Y. Starikovskiy | 19 | 0.90% | 2 | 3.03% |
| David E. Box | 16 | 0.76% | 1 | 1.52% |
| Prarit Bhargava | 13 | 0.62% | 1 | 1.52% |
| Valery A. Podrezov | 9 | 0.43% | 1 | 1.52% |
| Jesper Juhl | 5 | 0.24% | 1 | 1.52% |
| Tim Gardner | 5 | 0.24% | 1 | 1.52% |
| Erik Schmauss | 2 | 0.10% | 1 | 1.52% |
| Patrick Mochel | 1 | 0.05% | 1 | 1.52% |
| Total | 2105 | 66 |
// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 /****************************************************************************** * * Module Name: dsmethod - Parser/Interpreter interface - control method parsing * * Copyright (C) 2000 - 2018, 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 cleanup; } 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 cleanup; } 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); 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; }
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