Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 483 insertions, 0 deletions

diff --git a/drivers/acpi/acpica/nseval.c b/drivers/acpi/acpica/nseval.c
new file mode 100644
index 000000000..64ba80ede
--- /dev/null
+++ b/drivers/acpi/acpica/nseval.c
@@ -0,0 +1,483 @@
+// 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")
+
+/* 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_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:
+	/*
+	 * 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);
+}
+
+/*******************************************************************************
+ *
+ * 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.
+ *
+ * NOTE: With this option enabled, each block of detected executable AML
+ * code that is outside of any control method is wrapped with a temporary
+ * control method object and placed on a global list. The methods on this
+ * list are executed below.
+ *
+ * This function executes the module-level code for all tables only after
+ * all of the tables have been loaded. It is a legacy option and is
+ * not compatible with other ACPI implementations. See acpi_ns_load_table.
+ *
+ * This function will be removed when the legacy option is removed.
+ *
+ ******************************************************************************/
+
+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) {
+		ACPI_DEBUG_PRINT((ACPI_DB_INIT_NAMES,
+				  "Legacy MLC block list is empty\n"));
+
+		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;
+}
+
+/*******************************************************************************
+ *
+ * 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;
+}