diff options
Diffstat (limited to 'drivers/acpi/acpica/nseval.c')
| -rw-r--r-- | drivers/acpi/acpica/nseval.c | 306 |
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 0000000000..63748ac699 --- /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); +} |