diff options
Diffstat (limited to 'drivers/acpi/dispatcher/dsmethod.c')
| -rw-r--r-- | drivers/acpi/dispatcher/dsmethod.c | 623 |
1 files changed, 0 insertions, 623 deletions
diff --git a/drivers/acpi/dispatcher/dsmethod.c b/drivers/acpi/dispatcher/dsmethod.c deleted file mode 100644 index 279a5a60a0dd..000000000000 --- a/drivers/acpi/dispatcher/dsmethod.c +++ /dev/null @@ -1,623 +0,0 @@ -/****************************************************************************** - * - * Module Name: dsmethod - Parser/Interpreter interface - control method parsing - * - *****************************************************************************/ - -/* - * Copyright (C) 2000 - 2008, Intel Corp. - * All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions, and the following disclaimer, - * without modification. - * 2. Redistributions in binary form must reproduce at minimum a disclaimer - * substantially similar to the "NO WARRANTY" disclaimer below - * ("Disclaimer") and any redistribution must be conditioned upon - * including a substantially similar Disclaimer requirement for further - * binary redistribution. - * 3. Neither the names of the above-listed copyright holders nor the names - * of any contributors may be used to endorse or promote products derived - * from this software without specific prior written permission. - * - * Alternatively, this software may be distributed under the terms of the - * GNU General Public License ("GPL") version 2 as published by the Free - * Software Foundation. - * - * NO WARRANTY - * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS - * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT - * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR - * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT - * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL - * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS - * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) - * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, - * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING - * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE - * POSSIBILITY OF SUCH DAMAGES. - */ - -#include <acpi/acpi.h> -#include <acpi/amlcode.h> -#include <acpi/acdispat.h> -#include <acpi/acinterp.h> -#include <acpi/acnamesp.h> -#include <acpi/acdisasm.h> - -#define _COMPONENT ACPI_DISPATCHER -ACPI_MODULE_NAME("dsmethod") - -/* Local prototypes */ -static acpi_status -acpi_ds_create_method_mutex(union acpi_operand_object *method_desc); - -/******************************************************************************* - * - * 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 disassembler 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) -{ - 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. - */ - status = acpi_gbl_exception_handler(status, - walk_state->method_node ? - walk_state->method_node-> - name.integer : 0, - walk_state->opcode, - walk_state->aml_offset, - NULL); - acpi_ex_enter_interpreter(); - } - - acpi_ds_clear_implicit_return(walk_state); - -#ifdef ACPI_DISASSEMBLER - if (ACPI_FAILURE(status)) { - - /* Display method locals/args if disassembler is present */ - - acpi_dm_dump_method_info(status, walk_state, walk_state->op); - } -#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)) { - 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); - } - - /* 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.method_flags & AML_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 - * - * Top-level method invocation has no walk state at this point - */ - if (walk_state && - (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 (%d)", - 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; - 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; - } - } - - /* 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++; - 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) { - return_ACPI_STATUS(AE_NO_MEMORY); - } - - 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; - } - - /* - * 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)); - - /* Invoke an internal method if necessary */ - - if (obj_desc->method.method_flags & AML_METHOD_INTERNAL_ONLY) { - status = obj_desc->method.implementation(next_walk_state); - } - - return_ACPI_STATUS(status); - - cleanup: - - /* On error, we must terminate the method properly */ - - acpi_ds_terminate_control_method(obj_desc, next_walk_state); - if (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); - - /* - * 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 = NULL; - } - } - - /* - * Delete any namespace objects created anywhere within - * the namespace by the execution of this method - */ - acpi_ns_delete_namespace_by_owner(method_desc->method.owner_id); - } - - /* 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, %d 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 creating the synchronization semaphore. - */ - if ((method_desc->method.method_flags & AML_METHOD_SERIALIZED) - && (!method_desc->method.mutex)) { - (void)acpi_ds_create_method_mutex(method_desc); - } - - /* No more threads, we can free the owner_id */ - - acpi_ut_release_owner_id(&method_desc->method.owner_id); - } - - return_VOID; -} |