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-rw-r--r--drivers/acpi/acpica/nseval.c306
1 files changed, 306 insertions, 0 deletions
diff --git a/drivers/acpi/acpica/nseval.c b/drivers/acpi/acpica/nseval.c
new file mode 100644
index 000000000..63748ac69
--- /dev/null
+++ b/drivers/acpi/acpica/nseval.c
@@ -0,0 +1,306 @@
+// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
+/*******************************************************************************
+ *
+ * Module Name: nseval - Object evaluation, includes control method execution
+ *
+ ******************************************************************************/
+
+#include <acpi/acpi.h>
+#include "accommon.h"
+#include "acparser.h"
+#include "acinterp.h"
+#include "acnamesp.h"
+
+#define _COMPONENT ACPI_NAMESPACE
+ACPI_MODULE_NAME("nseval")
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ns_evaluate
+ *
+ * PARAMETERS: info - Evaluation info block, contains these fields
+ * and more:
+ * prefix_node - Prefix or Method/Object Node to execute
+ * relative_path - Name of method to execute, If NULL, the
+ * Node is the object to execute
+ * parameters - List of parameters to pass to the method,
+ * terminated by NULL. Params itself may be
+ * NULL if no parameters are being passed.
+ * parameter_type - Type of Parameter list
+ * return_object - Where to put method's return value (if
+ * any). If NULL, no value is returned.
+ * flags - ACPI_IGNORE_RETURN_VALUE to delete return
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Execute a control method or return the current value of an
+ * ACPI namespace object.
+ *
+ * MUTEX: Locks interpreter
+ *
+ ******************************************************************************/
+acpi_status acpi_ns_evaluate(struct acpi_evaluate_info *info)
+{
+ acpi_status status;
+
+ ACPI_FUNCTION_TRACE(ns_evaluate);
+
+ if (!info) {
+ return_ACPI_STATUS(AE_BAD_PARAMETER);
+ }
+
+ if (!info->node) {
+ /*
+ * Get the actual namespace node for the target object if we
+ * need to. Handles these cases:
+ *
+ * 1) Null node, valid pathname from root (absolute path)
+ * 2) Node and valid pathname (path relative to Node)
+ * 3) Node, Null pathname
+ */
+ status =
+ acpi_ns_get_node(info->prefix_node, info->relative_pathname,
+ ACPI_NS_NO_UPSEARCH, &info->node);
+ if (ACPI_FAILURE(status)) {
+ return_ACPI_STATUS(status);
+ }
+ }
+
+ /*
+ * For a method alias, we must grab the actual method node so that
+ * proper scoping context will be established before execution.
+ */
+ if (acpi_ns_get_type(info->node) == ACPI_TYPE_LOCAL_METHOD_ALIAS) {
+ info->node =
+ ACPI_CAST_PTR(struct acpi_namespace_node,
+ info->node->object);
+ }
+
+ /* Complete the info block initialization */
+
+ info->return_object = NULL;
+ info->node_flags = info->node->flags;
+ info->obj_desc = acpi_ns_get_attached_object(info->node);
+
+ ACPI_DEBUG_PRINT((ACPI_DB_NAMES, "%s [%p] Value %p\n",
+ info->relative_pathname, info->node,
+ acpi_ns_get_attached_object(info->node)));
+
+ /* Get info if we have a predefined name (_HID, etc.) */
+
+ info->predefined =
+ acpi_ut_match_predefined_method(info->node->name.ascii);
+
+ /* Get the full pathname to the object, for use in warning messages */
+
+ info->full_pathname = acpi_ns_get_normalized_pathname(info->node, TRUE);
+ if (!info->full_pathname) {
+ return_ACPI_STATUS(AE_NO_MEMORY);
+ }
+
+ /* Optional object evaluation log */
+
+ ACPI_DEBUG_PRINT_RAW((ACPI_DB_EVALUATION,
+ "%-26s: %s (%s)\n", " Enter evaluation",
+ &info->full_pathname[1],
+ acpi_ut_get_type_name(info->node->type)));
+
+ /* Count the number of arguments being passed in */
+
+ info->param_count = 0;
+ if (info->parameters) {
+ while (info->parameters[info->param_count]) {
+ info->param_count++;
+ }
+
+ /* Warn on impossible argument count */
+
+ if (info->param_count > ACPI_METHOD_NUM_ARGS) {
+ ACPI_WARN_PREDEFINED((AE_INFO, info->full_pathname,
+ ACPI_WARN_ALWAYS,
+ "Excess arguments (%u) - using only %u",
+ info->param_count,
+ ACPI_METHOD_NUM_ARGS));
+
+ info->param_count = ACPI_METHOD_NUM_ARGS;
+ }
+ }
+
+ /*
+ * For predefined names: Check that the declared argument count
+ * matches the ACPI spec -- otherwise this is a BIOS error.
+ */
+ acpi_ns_check_acpi_compliance(info->full_pathname, info->node,
+ info->predefined);
+
+ /*
+ * For all names: Check that the incoming argument count for
+ * this method/object matches the actual ASL/AML definition.
+ */
+ acpi_ns_check_argument_count(info->full_pathname, info->node,
+ info->param_count, info->predefined);
+
+ /* For predefined names: Typecheck all incoming arguments */
+
+ acpi_ns_check_argument_types(info);
+
+ /*
+ * Three major evaluation cases:
+ *
+ * 1) Object types that cannot be evaluated by definition
+ * 2) The object is a control method -- execute it
+ * 3) The object is not a method -- just return it's current value
+ */
+ switch (acpi_ns_get_type(info->node)) {
+ case ACPI_TYPE_ANY:
+ case ACPI_TYPE_DEVICE:
+ case ACPI_TYPE_EVENT:
+ case ACPI_TYPE_MUTEX:
+ case ACPI_TYPE_REGION:
+ case ACPI_TYPE_THERMAL:
+ case ACPI_TYPE_LOCAL_SCOPE:
+ /*
+ * 1) Disallow evaluation of these object types. For these,
+ * object evaluation is undefined.
+ */
+ ACPI_ERROR((AE_INFO,
+ "%s: This object type [%s] "
+ "never contains data and cannot be evaluated",
+ info->full_pathname,
+ acpi_ut_get_type_name(info->node->type)));
+
+ status = AE_TYPE;
+ goto cleanup;
+
+ case ACPI_TYPE_METHOD:
+ /*
+ * 2) Object is a control method - execute it
+ */
+
+ /* Verify that there is a method object associated with this node */
+
+ if (!info->obj_desc) {
+ ACPI_ERROR((AE_INFO,
+ "%s: Method has no attached sub-object",
+ info->full_pathname));
+ status = AE_NULL_OBJECT;
+ goto cleanup;
+ }
+
+ ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
+ "**** Execute method [%s] at AML address %p length %X\n",
+ info->full_pathname,
+ info->obj_desc->method.aml_start + 1,
+ info->obj_desc->method.aml_length - 1));
+
+ /*
+ * Any namespace deletion must acquire both the namespace and
+ * interpreter locks to ensure that no thread is using the portion of
+ * the namespace that is being deleted.
+ *
+ * Execute the method via the interpreter. The interpreter is locked
+ * here before calling into the AML parser
+ */
+ acpi_ex_enter_interpreter();
+ status = acpi_ps_execute_method(info);
+ acpi_ex_exit_interpreter();
+ break;
+
+ default:
+ /*
+ * 3) All other non-method objects -- get the current object value
+ */
+
+ /*
+ * Some objects require additional resolution steps (e.g., the Node
+ * may be a field that must be read, etc.) -- we can't just grab
+ * the object out of the node.
+ *
+ * Use resolve_node_to_value() to get the associated value.
+ *
+ * NOTE: we can get away with passing in NULL for a walk state because
+ * the Node is guaranteed to not be a reference to either a method
+ * local or a method argument (because this interface is never called
+ * from a running method.)
+ *
+ * Even though we do not directly invoke the interpreter for object
+ * resolution, we must lock it because we could access an op_region.
+ * The op_region access code assumes that the interpreter is locked.
+ */
+ acpi_ex_enter_interpreter();
+
+ /* TBD: resolve_node_to_value has a strange interface, fix */
+
+ info->return_object =
+ ACPI_CAST_PTR(union acpi_operand_object, info->node);
+
+ status =
+ acpi_ex_resolve_node_to_value(ACPI_CAST_INDIRECT_PTR
+ (struct acpi_namespace_node,
+ &info->return_object), NULL);
+ acpi_ex_exit_interpreter();
+
+ if (ACPI_FAILURE(status)) {
+ info->return_object = NULL;
+ goto cleanup;
+ }
+
+ ACPI_DEBUG_PRINT((ACPI_DB_NAMES, "Returned object %p [%s]\n",
+ info->return_object,
+ acpi_ut_get_object_type_name(info->
+ return_object)));
+
+ status = AE_CTRL_RETURN_VALUE; /* Always has a "return value" */
+ break;
+ }
+
+ /*
+ * For predefined names, check the return value against the ACPI
+ * specification. Some incorrect return value types are repaired.
+ */
+ (void)acpi_ns_check_return_value(info->node, info, info->param_count,
+ status, &info->return_object);
+
+ /* Check if there is a return value that must be dealt with */
+
+ if (status == AE_CTRL_RETURN_VALUE) {
+
+ /* If caller does not want the return value, delete it */
+
+ if (info->flags & ACPI_IGNORE_RETURN_VALUE) {
+ acpi_ut_remove_reference(info->return_object);
+ info->return_object = NULL;
+ }
+
+ /* Map AE_CTRL_RETURN_VALUE to AE_OK, we are done with it */
+
+ status = AE_OK;
+ } else if (ACPI_FAILURE(status)) {
+
+ /* If return_object exists, delete it */
+
+ if (info->return_object) {
+ acpi_ut_remove_reference(info->return_object);
+ info->return_object = NULL;
+ }
+ }
+
+ ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
+ "*** Completed evaluation of object %s ***\n",
+ info->relative_pathname));
+
+cleanup:
+ /* Optional object evaluation log */
+
+ ACPI_DEBUG_PRINT_RAW((ACPI_DB_EVALUATION,
+ "%-26s: %s\n", " Exit evaluation",
+ &info->full_pathname[1]));
+
+ /*
+ * Namespace was unlocked by the handling acpi_ns* function, so we
+ * just free the pathname and return
+ */
+ ACPI_FREE(info->full_pathname);
+ info->full_pathname = NULL;
+ return_ACPI_STATUS(status);
+}