Release 4.11 drivers/acpi/acpica/nseval.c

/*******************************************************************************
 *
 * Module Name: nseval - Object evaluation, includes control method execution
 *
 ******************************************************************************/

/*
 * Copyright (C) 2000 - 2017, 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 "accommon.h"
#include "acparser.h"
#include "acinterp.h"
#include "acnamesp.h"


#define _COMPONENT          ACPI_NAMESPACE
ACPI_MODULE_NAME("nseval")

/* Local prototypes */
static void
acpi_ns_exec_module_code(union acpi_operand_object *method_obj,
			 struct acpi_evaluate_info *info);

/*******************************************************************************
 *
 * 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);
	}

	/* 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_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 certain object types. For these,
                 *    object evaluation is undefined and not supported.
                 */
		ACPI_ERROR((AE_INFO,
			    "%s: Evaluation of object type [%s] is not supported",
			    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;
	}

	ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
			  "*** Completed evaluation of object %s ***\n",
			  info->relative_pathname));

cleanup:
	/*
         * 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);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Robert Moore
473
74.25%
10
43.48%
Len Brown
48
7.54%
3
13.04%
Linus Torvalds (pre-git)
45
7.06%
2
8.70%
Linus Torvalds
38
5.97%
2
8.70%
Andy Grover
30
4.71%
5
21.74%
Lv Zheng
3
0.47%
1
4.35%
Total
637
100.00%
23
100.00%

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_exec_module_code_list
 *
 * PARAMETERS:  None
 *
 * RETURN:      None. Exceptions during method execution are ignored, since
 *              we cannot abort a table load.
 *
 * DESCRIPTION: Execute all elements of the global module-level code list.
 *              Each element is executed as a single control method.
 *
 ******************************************************************************/



void acpi_ns_exec_module_code_list(void)
{
	union acpi_operand_object *prev;
	union acpi_operand_object *next;
	struct acpi_evaluate_info *info;
	u32 method_count = 0;

	ACPI_FUNCTION_TRACE(ns_exec_module_code_list);

	/* Exit now if the list is empty */

	next = acpi_gbl_module_code_list;
	if (!next) {
		return_VOID;
	}

	/* Allocate the evaluation information block */

	info = ACPI_ALLOCATE(sizeof(struct acpi_evaluate_info));
	if (!info) {
		return_VOID;
	}

	/* Walk the list, executing each "method" */

	while (next) {
		prev = next;
		next = next->method.mutex;

		/* Clear the link field and execute the method */

		prev->method.mutex = NULL;
		acpi_ns_exec_module_code(prev, info);
		method_count++;

		/* Delete the (temporary) method object */

		acpi_ut_remove_reference(prev);
	}

	ACPI_INFO(("Executed %u blocks of module-level executable AML code",
		   method_count));

	ACPI_FREE(info);
	acpi_gbl_module_code_list = NULL;
	return_VOID;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Lin Ming
131
100.00%
1
100.00%
Total
131
100.00%
1
100.00%

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_exec_module_code
 *
 * PARAMETERS:  method_obj          - Object container for the module-level code
 *              info                - Info block for method evaluation
 *
 * RETURN:      None. Exceptions during method execution are ignored, since
 *              we cannot abort a table load.
 *
 * DESCRIPTION: Execute a control method containing a block of module-level
 *              executable AML code. The control method is temporarily
 *              installed to the root node, then evaluated.
 *
 ******************************************************************************/


static void

acpi_ns_exec_module_code(union acpi_operand_object *method_obj,
			 struct acpi_evaluate_info *info)
{
	union acpi_operand_object *parent_obj;
	struct acpi_namespace_node *parent_node;
	acpi_object_type type;
	acpi_status status;

	ACPI_FUNCTION_TRACE(ns_exec_module_code);

	/*
         * Get the parent node. We cheat by using the next_object field
         * of the method object descriptor.
         */
	parent_node =
	    ACPI_CAST_PTR(struct acpi_namespace_node,
				    method_obj->method.next_object);
	type = acpi_ns_get_type(parent_node);

	/*
         * Get the region handler and save it in the method object. We may need
         * this if an operation region declaration causes a _REG method to be run.
         *
         * We can't do this in acpi_ps_link_module_code because
         * acpi_gbl_root_node->Object is NULL at PASS1.
         */
	if ((type == ACPI_TYPE_DEVICE) && parent_node->object) {
		method_obj->method.dispatch.handler =
		    parent_node->object->device.handler;
	}

	/* Must clear next_object (acpi_ns_attach_object needs the field) */

	method_obj->method.next_object = NULL;

	/* Initialize the evaluation information block */

	memset(info, 0, sizeof(struct acpi_evaluate_info));
	info->prefix_node = parent_node;

	/*
         * Get the currently attached parent object. Add a reference,
         * because the ref count will be decreased when the method object
         * is installed to the parent node.
         */
	parent_obj = acpi_ns_get_attached_object(parent_node);
	if (parent_obj) {
		acpi_ut_add_reference(parent_obj);
	}

	/* Install the method (module-level code) in the parent node */

	status =
	    acpi_ns_attach_object(parent_node, method_obj, ACPI_TYPE_METHOD);
	if (ACPI_FAILURE(status)) {
		goto exit;
	}

	/* Execute the parent node as a control method */

	status = acpi_ns_evaluate(info);

	ACPI_DEBUG_PRINT((ACPI_DB_INIT_NAMES,
			  "Executed module-level code at %p\n",
			  method_obj->method.aml_start));

	/* Delete a possible implicit return value (in slack mode) */

	if (info->return_object) {
		acpi_ut_remove_reference(info->return_object);
	}

	/* Detach the temporary method object */

	acpi_ns_detach_object(parent_node);

	/* Restore the original parent object */

	if (parent_obj) {
		status = acpi_ns_attach_object(parent_node, parent_obj, type);
	} else {
		parent_node->type = (u8)type;
	}

exit:
	if (parent_obj) {
		acpi_ut_remove_reference(parent_obj);
	}
	return_VOID;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Lin Ming
249
98.81%
5
62.50%
Robert Moore
2
0.79%
2
25.00%
Lv Zheng
1
0.40%
1
12.50%
Total
252
100.00%
8
100.00%

Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Robert Moore
480
45.11%
15
40.54%
Lin Ming
397
37.31%
5
13.51%
Linus Torvalds (pre-git)
59
5.55%
2
5.41%
Len Brown
52
4.89%
4
10.81%
Linus Torvalds
39
3.67%
2
5.41%
Andy Grover
31
2.91%
5
13.51%
Lv Zheng
4
0.38%
2
5.41%
Gong Zhaogang
1
0.09%
1
2.70%
Patrick Mochel
1
0.09%
1
2.70%
Total
1064
100.00%
37
100.00%
Directory: drivers/acpi/acpica

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