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-rw-r--r--drivers/acpi/dispatcher/dsmethod.c597
1 files changed, 597 insertions, 0 deletions
diff --git a/drivers/acpi/dispatcher/dsmethod.c b/drivers/acpi/dispatcher/dsmethod.c
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index 00000000000..9f0456cb9bb
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+++ b/drivers/acpi/dispatcher/dsmethod.c
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+/******************************************************************************
+ *
+ * Module Name: dsmethod - Parser/Interpreter interface - control method parsing
+ *
+ *****************************************************************************/
+
+/*
+ * Copyright (C) 2000 - 2005, R. Byron Moore
+ * 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/acparser.h>
+#include <acpi/amlcode.h>
+#include <acpi/acdispat.h>
+#include <acpi/acinterp.h>
+#include <acpi/acnamesp.h>
+
+
+#define _COMPONENT ACPI_DISPATCHER
+ ACPI_MODULE_NAME ("dsmethod")
+
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ds_parse_method
+ *
+ * PARAMETERS: obj_handle - Method node
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Call the parser and parse the AML that is associated with the
+ * method.
+ *
+ * MUTEX: Assumes parser is locked
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ds_parse_method (
+ acpi_handle obj_handle)
+{
+ acpi_status status;
+ union acpi_operand_object *obj_desc;
+ union acpi_parse_object *op;
+ struct acpi_namespace_node *node;
+ acpi_owner_id owner_id;
+ struct acpi_walk_state *walk_state;
+
+
+ ACPI_FUNCTION_TRACE_PTR ("ds_parse_method", obj_handle);
+
+
+ /* Parameter Validation */
+
+ if (!obj_handle) {
+ return_ACPI_STATUS (AE_NULL_ENTRY);
+ }
+
+ ACPI_DEBUG_PRINT ((ACPI_DB_PARSE, "**** Parsing [%4.4s] **** named_obj=%p\n",
+ acpi_ut_get_node_name (obj_handle), obj_handle));
+
+ /* Extract the method object from the method Node */
+
+ node = (struct acpi_namespace_node *) obj_handle;
+ obj_desc = acpi_ns_get_attached_object (node);
+ if (!obj_desc) {
+ return_ACPI_STATUS (AE_NULL_OBJECT);
+ }
+
+ /* Create a mutex for the method if there is a concurrency limit */
+
+ if ((obj_desc->method.concurrency != ACPI_INFINITE_CONCURRENCY) &&
+ (!obj_desc->method.semaphore)) {
+ status = acpi_os_create_semaphore (obj_desc->method.concurrency,
+ obj_desc->method.concurrency,
+ &obj_desc->method.semaphore);
+ if (ACPI_FAILURE (status)) {
+ return_ACPI_STATUS (status);
+ }
+ }
+
+ /*
+ * Allocate a new parser op to be the root of the parsed
+ * method tree
+ */
+ op = acpi_ps_alloc_op (AML_METHOD_OP);
+ if (!op) {
+ return_ACPI_STATUS (AE_NO_MEMORY);
+ }
+
+ /* Init new op with the method name and pointer back to the Node */
+
+ acpi_ps_set_name (op, node->name.integer);
+ op->common.node = node;
+
+ /*
+ * Get a new owner_id for objects created by this method. Namespace
+ * objects (such as Operation Regions) can be created during the
+ * first pass parse.
+ */
+ owner_id = acpi_ut_allocate_owner_id (ACPI_OWNER_TYPE_METHOD);
+ obj_desc->method.owning_id = owner_id;
+
+ /* Create and initialize a new walk state */
+
+ walk_state = acpi_ds_create_walk_state (owner_id, NULL, NULL, NULL);
+ if (!walk_state) {
+ 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, 1);
+ if (ACPI_FAILURE (status)) {
+ acpi_ds_delete_walk_state (walk_state);
+ return_ACPI_STATUS (status);
+ }
+
+ /*
+ * Parse the method, first pass
+ *
+ * The first pass load is where newly declared named objects are
+ * added into the namespace. Actual evaluation of
+ * the named objects (what would be called a "second
+ * pass") happens during the actual execution of the
+ * method so that operands to the named objects can
+ * take on dynamic run-time values.
+ */
+ status = acpi_ps_parse_aml (walk_state);
+ if (ACPI_FAILURE (status)) {
+ return_ACPI_STATUS (status);
+ }
+
+ ACPI_DEBUG_PRINT ((ACPI_DB_PARSE,
+ "**** [%4.4s] Parsed **** named_obj=%p Op=%p\n",
+ acpi_ut_get_node_name (obj_handle), obj_handle, op));
+
+ acpi_ps_delete_parse_tree (op);
+ return_ACPI_STATUS (status);
+}
+
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ds_begin_method_execution
+ *
+ * PARAMETERS: method_node - Node of the method
+ * obj_desc - The method object
+ * calling_method_node - Caller of this method (if non-null)
+ *
+ * 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_namespace_node *calling_method_node)
+{
+ acpi_status status = AE_OK;
+
+
+ ACPI_FUNCTION_TRACE_PTR ("ds_begin_method_execution", method_node);
+
+
+ if (!method_node) {
+ return_ACPI_STATUS (AE_NULL_ENTRY);
+ }
+
+ /*
+ * If there is a concurrency limit on this method, we need to
+ * obtain a unit from the method semaphore.
+ */
+ if (obj_desc->method.semaphore) {
+ /*
+ * Allow recursive method calls, up to the reentrancy/concurrency
+ * limit imposed by the SERIALIZED rule and the sync_level method
+ * parameter.
+ *
+ * The point of this code is to avoid permanently blocking a
+ * thread that is making recursive method calls.
+ */
+ if (method_node == calling_method_node) {
+ if (obj_desc->method.thread_count >= obj_desc->method.concurrency) {
+ return_ACPI_STATUS (AE_AML_METHOD_LIMIT);
+ }
+ }
+
+ /*
+ * Get a unit from the method semaphore. This releases the
+ * interpreter if we block
+ */
+ status = acpi_ex_system_wait_semaphore (obj_desc->method.semaphore,
+ ACPI_WAIT_FOREVER);
+ }
+
+ /*
+ * 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);
+}
+
+
+/*******************************************************************************
+ *
+ * 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;
+ union acpi_operand_object *obj_desc;
+ struct acpi_parameter_info info;
+ u32 i;
+
+
+ ACPI_FUNCTION_TRACE_PTR ("ds_call_control_method", this_walk_state);
+
+ ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, "Execute 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);
+ }
+
+ obj_desc->method.owning_id = acpi_ut_allocate_owner_id (ACPI_OWNER_TYPE_METHOD);
+
+ /* Init for new method, wait on concurrency semaphore */
+
+ status = acpi_ds_begin_method_execution (method_node, obj_desc,
+ this_walk_state->method_node);
+ if (ACPI_FAILURE (status)) {
+ return_ACPI_STATUS (status);
+ }
+
+ if (!(obj_desc->method.method_flags & AML_METHOD_INTERNAL_ONLY)) {
+ /* 1) Parse: Create a new walk state for the preempting walk */
+
+ next_walk_state = acpi_ds_create_walk_state (obj_desc->method.owning_id,
+ op, obj_desc, NULL);
+ if (!next_walk_state) {
+ return_ACPI_STATUS (AE_NO_MEMORY);
+ }
+
+ /* Create and init a Root Node */
+
+ op = acpi_ps_create_scope_op ();
+ if (!op) {
+ status = AE_NO_MEMORY;
+ goto cleanup;
+ }
+
+ status = acpi_ds_init_aml_walk (next_walk_state, op, method_node,
+ obj_desc->method.aml_start, obj_desc->method.aml_length,
+ NULL, 1);
+ if (ACPI_FAILURE (status)) {
+ acpi_ds_delete_walk_state (next_walk_state);
+ goto cleanup;
+ }
+
+ /* Begin AML parse */
+
+ status = acpi_ps_parse_aml (next_walk_state);
+ acpi_ps_delete_parse_tree (op);
+ }
+
+ /* 2) Execute: Create a new state for the preempting walk */
+
+ next_walk_state = acpi_ds_create_walk_state (obj_desc->method.owning_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.
+ * Null terminate the list of arguments
+ */
+ this_walk_state->operands [this_walk_state->num_operands] = NULL;
+
+ info.parameters = &this_walk_state->operands[0];
+ info.parameter_type = ACPI_PARAM_ARGS;
+
+ status = acpi_ds_init_aml_walk (next_walk_state, NULL, method_node,
+ obj_desc->method.aml_start, obj_desc->method.aml_length,
+ &info, 3);
+ 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,
+ "Starting nested execution, newstate=%p\n", next_walk_state));
+
+ if (obj_desc->method.method_flags & AML_METHOD_INTERNAL_ONLY) {
+ status = obj_desc->method.implementation (next_walk_state);
+ return_ACPI_STATUS (status);
+ }
+
+ return_ACPI_STATUS (AE_OK);
+
+
+ /* On error, we must delete the new walk state */
+
+cleanup:
+ if (next_walk_state && (next_walk_state->method_desc)) {
+ /* Decrement the thread count on the method parse tree */
+
+ next_walk_state->method_desc->method.thread_count--;
+ }
+ (void) acpi_ds_terminate_control_method (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;
+
+
+ ACPI_FUNCTION_TRACE_PTR ("ds_restart_control_method", walk_state);
+
+
+ ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
+ "****Restart [%4.4s] Op %p return_value_from_callee %p\n",
+ (char *) &walk_state->method_node->name, walk_state->method_call_op,
+ return_desc));
+
+ ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
+ " return_from_this_method_used?=%X res_stack %p Walk %p\n",
+ walk_state->return_used,
+ walk_state->results, walk_state));
+
+ /* Did the called method return a value? */
+
+ if (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 a so-called "implicit return". Some AML code
+ * assumes that the last value of the method is "implicitly" returned
+ * to the caller. Just save the last result 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)) {
+ /*
+ * Delete the return value if it will not be used by the
+ * calling method
+ */
+ acpi_ut_remove_reference (return_desc);
+ }
+ }
+
+ return_ACPI_STATUS (AE_OK);
+}
+
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ds_terminate_control_method
+ *
+ * PARAMETERS: walk_state - State of the method
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Terminate a control method. Delete everything that the method
+ * created, delete all locals and arguments, and delete the parse
+ * tree if requested.
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ds_terminate_control_method (
+ struct acpi_walk_state *walk_state)
+{
+ union acpi_operand_object *obj_desc;
+ struct acpi_namespace_node *method_node;
+ acpi_status status;
+
+
+ ACPI_FUNCTION_TRACE_PTR ("ds_terminate_control_method", walk_state);
+
+
+ if (!walk_state) {
+ return (AE_BAD_PARAMETER);
+ }
+
+ /* The current method object was saved in the walk state */
+
+ obj_desc = walk_state->method_desc;
+ if (!obj_desc) {
+ return_ACPI_STATUS (AE_OK);
+ }
+
+ /* Delete all arguments and locals */
+
+ acpi_ds_method_data_delete_all (walk_state);
+
+ /*
+ * Lock the parser while we terminate this method.
+ * If this is the last thread executing the method,
+ * we have additional cleanup to perform
+ */
+ status = acpi_ut_acquire_mutex (ACPI_MTX_PARSER);
+ if (ACPI_FAILURE (status)) {
+ return_ACPI_STATUS (status);
+ }
+
+ /* Signal completion of the execution of this method if necessary */
+
+ if (walk_state->method_desc->method.semaphore) {
+ status = acpi_os_signal_semaphore (
+ walk_state->method_desc->method.semaphore, 1);
+ if (ACPI_FAILURE (status)) {
+ ACPI_REPORT_ERROR (("Could not signal method semaphore\n"));
+ status = AE_OK;
+
+ /* Ignore error and continue cleanup */
+ }
+ }
+
+ if (walk_state->method_desc->method.thread_count) {
+ ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
+ "*** Not deleting method namespace, there are still %d threads\n",
+ walk_state->method_desc->method.thread_count));
+ }
+
+ if (!walk_state->method_desc->method.thread_count) {
+ /*
+ * Support to dynamically change a method from not_serialized to
+ * Serialized if it appears that the method is written foolishly 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 ((walk_state->method_desc->method.concurrency == 1) &&
+ (!walk_state->method_desc->method.semaphore)) {
+ status = acpi_os_create_semaphore (1,
+ 1,
+ &walk_state->method_desc->method.semaphore);
+ }
+
+ /*
+ * There are no more threads executing this method. Perform
+ * additional cleanup.
+ *
+ * The method Node is stored in the walk state
+ */
+ method_node = walk_state->method_node;
+
+ /*
+ * Delete any namespace entries created immediately underneath
+ * the method
+ */
+ status = acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE);
+ if (ACPI_FAILURE (status)) {
+ return_ACPI_STATUS (status);
+ }
+
+ if (method_node->child) {
+ acpi_ns_delete_namespace_subtree (method_node);
+ }
+
+ /*
+ * Delete any namespace entries created anywhere else within
+ * the namespace
+ */
+ acpi_ns_delete_namespace_by_owner (walk_state->method_desc->method.owning_id);
+ status = acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
+ if (ACPI_FAILURE (status)) {
+ return_ACPI_STATUS (status);
+ }
+ }
+
+ status = acpi_ut_release_mutex (ACPI_MTX_PARSER);
+ return_ACPI_STATUS (status);
+}
+
+
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-18 22:18:02 +0000