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-rw-r--r--drivers/acpi/acpica/dspkginit.c531
1 files changed, 531 insertions, 0 deletions
diff --git a/drivers/acpi/acpica/dspkginit.c b/drivers/acpi/acpica/dspkginit.c
new file mode 100644
index 000000000..d869568d5
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+++ b/drivers/acpi/acpica/dspkginit.c
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+// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
+/******************************************************************************
+ *
+ * Module Name: dspkginit - Completion of deferred package initialization
+ *
+ * Copyright (C) 2000 - 2020, Intel Corp.
+ *
+ *****************************************************************************/
+
+#include <acpi/acpi.h>
+#include "accommon.h"
+#include "acnamesp.h"
+#include "amlcode.h"
+#include "acdispat.h"
+#include "acinterp.h"
+#include "acparser.h"
+
+#define _COMPONENT ACPI_NAMESPACE
+ACPI_MODULE_NAME("dspkginit")
+
+/* Local prototypes */
+static void
+acpi_ds_resolve_package_element(union acpi_operand_object **element);
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ds_build_internal_package_obj
+ *
+ * PARAMETERS: walk_state - Current walk state
+ * op - Parser object to be translated
+ * element_count - Number of elements in the package - this is
+ * the num_elements argument to Package()
+ * obj_desc_ptr - Where the ACPI internal object is returned
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Translate a parser Op package object to the equivalent
+ * namespace object
+ *
+ * NOTE: The number of elements in the package will be always be the num_elements
+ * count, regardless of the number of elements in the package list. If
+ * num_elements is smaller, only that many package list elements are used.
+ * if num_elements is larger, the Package object is padded out with
+ * objects of type Uninitialized (as per ACPI spec.)
+ *
+ * Even though the ASL compilers do not allow num_elements to be smaller
+ * than the Package list length (for the fixed length package opcode), some
+ * BIOS code modifies the AML on the fly to adjust the num_elements, and
+ * this code compensates for that. This also provides compatibility with
+ * other AML interpreters.
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ds_build_internal_package_obj(struct acpi_walk_state *walk_state,
+ union acpi_parse_object *op,
+ u32 element_count,
+ union acpi_operand_object **obj_desc_ptr)
+{
+ union acpi_parse_object *arg;
+ union acpi_parse_object *parent;
+ union acpi_operand_object *obj_desc = NULL;
+ acpi_status status = AE_OK;
+ u8 module_level_code = FALSE;
+ u16 reference_count;
+ u32 index;
+ u32 i;
+
+ ACPI_FUNCTION_TRACE(ds_build_internal_package_obj);
+
+ /* Check if we are executing module level code */
+
+ if (walk_state->parse_flags & ACPI_PARSE_MODULE_LEVEL) {
+ module_level_code = TRUE;
+ }
+
+ /* Find the parent of a possibly nested package */
+
+ parent = op->common.parent;
+ while ((parent->common.aml_opcode == AML_PACKAGE_OP) ||
+ (parent->common.aml_opcode == AML_VARIABLE_PACKAGE_OP)) {
+ parent = parent->common.parent;
+ }
+
+ /*
+ * If we are evaluating a Named package object of the form:
+ * Name (xxxx, Package)
+ * the package object already exists, otherwise it must be created.
+ */
+ obj_desc = *obj_desc_ptr;
+ if (!obj_desc) {
+ obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_PACKAGE);
+ *obj_desc_ptr = obj_desc;
+ if (!obj_desc) {
+ return_ACPI_STATUS(AE_NO_MEMORY);
+ }
+
+ obj_desc->package.node = parent->common.node;
+ }
+
+ if (obj_desc->package.flags & AOPOBJ_DATA_VALID) { /* Just in case */
+ return_ACPI_STATUS(AE_OK);
+ }
+
+ /*
+ * Allocate the element array (array of pointers to the individual
+ * objects) if necessary. the count is based on the num_elements
+ * parameter. Add an extra pointer slot so that the list is always
+ * null terminated.
+ */
+ if (!obj_desc->package.elements) {
+ obj_desc->package.elements = ACPI_ALLOCATE_ZEROED(((acpi_size)
+ element_count
+ +
+ 1) *
+ sizeof(void
+ *));
+
+ if (!obj_desc->package.elements) {
+ acpi_ut_delete_object_desc(obj_desc);
+ return_ACPI_STATUS(AE_NO_MEMORY);
+ }
+
+ obj_desc->package.count = element_count;
+ }
+
+ /* First arg is element count. Second arg begins the initializer list */
+
+ arg = op->common.value.arg;
+ arg = arg->common.next;
+
+ /*
+ * If we are executing module-level code, we will defer the
+ * full resolution of the package elements in order to support
+ * forward references from the elements. This provides
+ * compatibility with other ACPI implementations.
+ */
+ if (module_level_code) {
+ obj_desc->package.aml_start = walk_state->aml;
+ obj_desc->package.aml_length = 0;
+
+ ACPI_DEBUG_PRINT_RAW((ACPI_DB_PARSE,
+ "%s: Deferring resolution of Package elements\n",
+ ACPI_GET_FUNCTION_NAME));
+ }
+
+ /*
+ * Initialize the elements of the package, up to the num_elements count.
+ * Package is automatically padded with uninitialized (NULL) elements
+ * if num_elements is greater than the package list length. Likewise,
+ * Package is truncated if num_elements is less than the list length.
+ */
+ for (i = 0; arg && (i < element_count); i++) {
+ if (arg->common.aml_opcode == AML_INT_RETURN_VALUE_OP) {
+ if (!arg->common.node) {
+ /*
+ * This is the case where an expression has returned a value.
+ * The use of expressions (term_args) within individual
+ * package elements is not supported by the AML interpreter,
+ * even though the ASL grammar supports it. Example:
+ *
+ * Name (INT1, 0x1234)
+ *
+ * Name (PKG3, Package () {
+ * Add (INT1, 0xAAAA0000)
+ * })
+ *
+ * 1) No known AML interpreter supports this type of construct
+ * 2) This fixes a fault if the construct is encountered
+ */
+ ACPI_EXCEPTION((AE_INFO, AE_SUPPORT,
+ "Expressions within package elements are not supported"));
+
+ /* Cleanup the return object, it is not needed */
+
+ acpi_ut_remove_reference(walk_state->results->
+ results.obj_desc[0]);
+ return_ACPI_STATUS(AE_SUPPORT);
+ }
+
+ if (arg->common.node->type == ACPI_TYPE_METHOD) {
+ /*
+ * A method reference "looks" to the parser to be a method
+ * invocation, so we special case it here
+ */
+ arg->common.aml_opcode = AML_INT_NAMEPATH_OP;
+ status =
+ acpi_ds_build_internal_object(walk_state,
+ arg,
+ &obj_desc->
+ package.
+ elements[i]);
+ } else {
+ /* This package element is already built, just get it */
+
+ obj_desc->package.elements[i] =
+ ACPI_CAST_PTR(union acpi_operand_object,
+ arg->common.node);
+ }
+ } else {
+ status =
+ acpi_ds_build_internal_object(walk_state, arg,
+ &obj_desc->package.
+ elements[i]);
+ if (status == AE_NOT_FOUND) {
+ ACPI_ERROR((AE_INFO, "%-48s",
+ "****DS namepath not found"));
+ }
+
+ if (!module_level_code) {
+ /*
+ * Initialize this package element. This function handles the
+ * resolution of named references within the package.
+ * Forward references from module-level code are deferred
+ * until all ACPI tables are loaded.
+ */
+ acpi_ds_init_package_element(0,
+ obj_desc->package.
+ elements[i], NULL,
+ &obj_desc->package.
+ elements[i]);
+ }
+ }
+
+ if (*obj_desc_ptr) {
+
+ /* Existing package, get existing reference count */
+
+ reference_count =
+ (*obj_desc_ptr)->common.reference_count;
+ if (reference_count > 1) {
+
+ /* Make new element ref count match original ref count */
+ /* TBD: Probably need an acpi_ut_add_references function */
+
+ for (index = 0;
+ index < ((u32)reference_count - 1);
+ index++) {
+ acpi_ut_add_reference((obj_desc->
+ package.
+ elements[i]));
+ }
+ }
+ }
+
+ arg = arg->common.next;
+ }
+
+ /* Check for match between num_elements and actual length of package_list */
+
+ if (arg) {
+ /*
+ * num_elements was exhausted, but there are remaining elements in
+ * the package_list. Truncate the package to num_elements.
+ *
+ * Note: technically, this is an error, from ACPI spec: "It is an
+ * error for NumElements to be less than the number of elements in
+ * the PackageList". However, we just print a message and no
+ * exception is returned. This provides compatibility with other
+ * ACPI implementations. Some firmware implementations will alter
+ * the num_elements on the fly, possibly creating this type of
+ * ill-formed package object.
+ */
+ while (arg) {
+ /*
+ * We must delete any package elements that were created earlier
+ * and are not going to be used because of the package truncation.
+ */
+ if (arg->common.node) {
+ acpi_ut_remove_reference(ACPI_CAST_PTR
+ (union
+ acpi_operand_object,
+ arg->common.node));
+ arg->common.node = NULL;
+ }
+
+ /* Find out how many elements there really are */
+
+ i++;
+ arg = arg->common.next;
+ }
+
+ ACPI_INFO(("Actual Package length (%u) is larger than "
+ "NumElements field (%u), truncated",
+ i, element_count));
+ } else if (i < element_count) {
+ /*
+ * Arg list (elements) was exhausted, but we did not reach
+ * num_elements count.
+ *
+ * Note: this is not an error, the package is padded out
+ * with NULLs as per the ACPI specification.
+ */
+ ACPI_DEBUG_PRINT_RAW((ACPI_DB_INFO,
+ "%s: Package List length (%u) smaller than NumElements "
+ "count (%u), padded with null elements\n",
+ ACPI_GET_FUNCTION_NAME, i,
+ element_count));
+ }
+
+ /* Module-level packages will be resolved later */
+
+ if (!module_level_code) {
+ obj_desc->package.flags |= AOPOBJ_DATA_VALID;
+ }
+
+ op->common.node = ACPI_CAST_PTR(struct acpi_namespace_node, obj_desc);
+ return_ACPI_STATUS(status);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ds_init_package_element
+ *
+ * PARAMETERS: acpi_pkg_callback
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Resolve a named reference element within a package object
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ds_init_package_element(u8 object_type,
+ union acpi_operand_object *source_object,
+ union acpi_generic_state *state, void *context)
+{
+ union acpi_operand_object **element_ptr;
+
+ ACPI_FUNCTION_TRACE(ds_init_package_element);
+
+ if (!source_object) {
+ return_ACPI_STATUS(AE_OK);
+ }
+
+ /*
+ * The following code is a bit of a hack to workaround a (current)
+ * limitation of the acpi_pkg_callback interface. We need a pointer
+ * to the location within the element array because a new object
+ * may be created and stored there.
+ */
+ if (context) {
+
+ /* A direct call was made to this function */
+
+ element_ptr = (union acpi_operand_object **)context;
+ } else {
+ /* Call came from acpi_ut_walk_package_tree */
+
+ element_ptr = state->pkg.this_target_obj;
+ }
+
+ /* We are only interested in reference objects/elements */
+
+ if (source_object->common.type == ACPI_TYPE_LOCAL_REFERENCE) {
+
+ /* Attempt to resolve the (named) reference to a namespace node */
+
+ acpi_ds_resolve_package_element(element_ptr);
+ } else if (source_object->common.type == ACPI_TYPE_PACKAGE) {
+ source_object->package.flags |= AOPOBJ_DATA_VALID;
+ }
+
+ return_ACPI_STATUS(AE_OK);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ds_resolve_package_element
+ *
+ * PARAMETERS: element_ptr - Pointer to a reference object
+ *
+ * RETURN: Possible new element is stored to the indirect element_ptr
+ *
+ * DESCRIPTION: Resolve a package element that is a reference to a named
+ * object.
+ *
+ ******************************************************************************/
+
+static void
+acpi_ds_resolve_package_element(union acpi_operand_object **element_ptr)
+{
+ acpi_status status;
+ acpi_status status2;
+ union acpi_generic_state scope_info;
+ union acpi_operand_object *element = *element_ptr;
+ struct acpi_namespace_node *resolved_node;
+ struct acpi_namespace_node *original_node;
+ char *external_path = "";
+ acpi_object_type type;
+
+ ACPI_FUNCTION_TRACE(ds_resolve_package_element);
+
+ /* Check if reference element is already resolved */
+
+ if (element->reference.resolved) {
+ ACPI_DEBUG_PRINT_RAW((ACPI_DB_PARSE,
+ "%s: Package element is already resolved\n",
+ ACPI_GET_FUNCTION_NAME));
+
+ return_VOID;
+ }
+
+ /* Element must be a reference object of correct type */
+
+ scope_info.scope.node = element->reference.node; /* Prefix node */
+
+ status = acpi_ns_lookup(&scope_info, (char *)element->reference.aml,
+ ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE,
+ ACPI_NS_SEARCH_PARENT | ACPI_NS_DONT_OPEN_SCOPE,
+ NULL, &resolved_node);
+ if (ACPI_FAILURE(status)) {
+ if ((status == AE_NOT_FOUND)
+ && acpi_gbl_ignore_package_resolution_errors) {
+ /*
+ * Optionally be silent about the NOT_FOUND case for the referenced
+ * name. Although this is potentially a serious problem,
+ * it can generate a lot of noise/errors on platforms whose
+ * firmware carries around a bunch of unused Package objects.
+ * To disable these errors, set this global to TRUE:
+ * acpi_gbl_ignore_package_resolution_errors
+ *
+ * If the AML actually tries to use such a package, the unresolved
+ * element(s) will be replaced with NULL elements.
+ */
+
+ /* Referenced name not found, set the element to NULL */
+
+ acpi_ut_remove_reference(*element_ptr);
+ *element_ptr = NULL;
+ return_VOID;
+ }
+
+ status2 = acpi_ns_externalize_name(ACPI_UINT32_MAX,
+ (char *)element->reference.
+ aml, NULL, &external_path);
+
+ ACPI_EXCEPTION((AE_INFO, status,
+ "While resolving a named reference package element - %s",
+ external_path));
+ if (ACPI_SUCCESS(status2)) {
+ ACPI_FREE(external_path);
+ }
+
+ /* Could not resolve name, set the element to NULL */
+
+ acpi_ut_remove_reference(*element_ptr);
+ *element_ptr = NULL;
+ return_VOID;
+ } else if (resolved_node->type == ACPI_TYPE_ANY) {
+
+ /* Named reference not resolved, return a NULL package element */
+
+ ACPI_ERROR((AE_INFO,
+ "Could not resolve named package element [%4.4s] in [%4.4s]",
+ resolved_node->name.ascii,
+ scope_info.scope.node->name.ascii));
+ *element_ptr = NULL;
+ return_VOID;
+ }
+
+ /*
+ * Special handling for Alias objects. We need resolved_node to point
+ * to the Alias target. This effectively "resolves" the alias.
+ */
+ if (resolved_node->type == ACPI_TYPE_LOCAL_ALIAS) {
+ resolved_node = ACPI_CAST_PTR(struct acpi_namespace_node,
+ resolved_node->object);
+ }
+
+ /* Update the reference object */
+
+ element->reference.resolved = TRUE;
+ element->reference.node = resolved_node;
+ type = element->reference.node->type;
+
+ /*
+ * Attempt to resolve the node to a value before we insert it into
+ * the package. If this is a reference to a common data type,
+ * resolve it immediately. According to the ACPI spec, package
+ * elements can only be "data objects" or method references.
+ * Attempt to resolve to an Integer, Buffer, String or Package.
+ * If cannot, return the named reference (for things like Devices,
+ * Methods, etc.) Buffer Fields and Fields will resolve to simple
+ * objects (int/buf/str/pkg).
+ *
+ * NOTE: References to things like Devices, Methods, Mutexes, etc.
+ * will remain as named references. This behavior is not described
+ * in the ACPI spec, but it appears to be an oversight.
+ */
+ original_node = resolved_node;
+ status = acpi_ex_resolve_node_to_value(&resolved_node, NULL);
+ if (ACPI_FAILURE(status)) {
+ return_VOID;
+ }
+
+ switch (type) {
+ /*
+ * These object types are a result of named references, so we will
+ * leave them as reference objects. In other words, these types
+ * have no intrinsic "value".
+ */
+ case ACPI_TYPE_DEVICE:
+ case ACPI_TYPE_THERMAL:
+ case ACPI_TYPE_METHOD:
+ break;
+
+ case ACPI_TYPE_MUTEX:
+ case ACPI_TYPE_POWER:
+ case ACPI_TYPE_PROCESSOR:
+ case ACPI_TYPE_EVENT:
+ case ACPI_TYPE_REGION:
+
+ /* acpi_ex_resolve_node_to_value gave these an extra reference */
+
+ acpi_ut_remove_reference(original_node->object);
+ break;
+
+ default:
+ /*
+ * For all other types - the node was resolved to an actual
+ * operand object with a value, return the object. Remove
+ * a reference on the existing object.
+ */
+ acpi_ut_remove_reference(element);
+ *element_ptr = (union acpi_operand_object *)resolved_node;
+ break;
+ }
+
+ return_VOID;
+}
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