ACPICA: Support for external package objects as method arguments

Implemented support to allow Package objects to be passed as
method arguments to the acpi_evaluate_object interface. Previously,
this would return an AE_NOT_IMPLEMENTED exception.

Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

3 files changed, 94 insertions, 70 deletions

diff --git a/drivers/acpi/utilities/utcopy.c b/drivers/acpi/utilities/utcopy.c
index 4c1e00874dff..879eaa10d3ae 100644
--- a/drivers/acpi/utilities/utcopy.c
+++ b/drivers/acpi/utilities/utcopy.c
@@ -68,6 +68,10 @@ acpi_ut_copy_esimple_to_isimple(union acpi_object *user_obj,
                                 union acpi_operand_object **return_obj);
 
 static acpi_status
+acpi_ut_copy_epackage_to_ipackage(union acpi_object *external_object,
+                                  union acpi_operand_object **internal_object);
+
+static acpi_status
 acpi_ut_copy_simple_object(union acpi_operand_object *source_desc,
                            union acpi_operand_object *dest_desc);
 
@@ -518,77 +522,73 @@ acpi_ut_copy_esimple_to_isimple(union acpi_object *external_object,
         return_ACPI_STATUS(AE_NO_MEMORY);
 }
 
-#ifdef ACPI_FUTURE_IMPLEMENTATION
-/* Code to convert packages that are parameters to control methods */
-
 /*******************************************************************************
  *
  * FUNCTION:    acpi_ut_copy_epackage_to_ipackage
  *
- * PARAMETERS:  *internal_object   - Pointer to the object we are returning
- *              *Buffer            - Where the object is returned
- *              *space_used        - Where the length of the object is returned
+ * PARAMETERS:  external_object     - The external object to be converted
+ *              internal_object     - Where the internal object is returned
  *
  * RETURN:      Status
  *
- * DESCRIPTION: This function is called to place a package object in a user
- *              buffer.  A package object by definition contains other objects.
- *
- *              The buffer is assumed to have sufficient space for the object.
- *              The caller must have verified the buffer length needed using the
- *              acpi_ut_get_object_size function before calling this function.
+ * DESCRIPTION: Copy an external package object to an internal package.
+ *              Handles nested packages.
  *
  ******************************************************************************/
 
 static acpi_status
-acpi_ut_copy_epackage_to_ipackage(union acpi_operand_object *internal_object,
-                                  u8 * buffer, u32 * space_used)
+acpi_ut_copy_epackage_to_ipackage(union acpi_object *external_object,
+                                  union acpi_operand_object **internal_object)
 {
-        u8 *free_space;
-        union acpi_object *external_object;
-        u32 length = 0;
-        u32 this_index;
-        u32 object_space = 0;
-        union acpi_operand_object *this_internal_obj;
-        union acpi_object *this_external_obj;
+        acpi_status status = AE_OK;
+        union acpi_operand_object *package_object;
+        union acpi_operand_object **package_elements;
+        acpi_native_uint i;
 
         ACPI_FUNCTION_TRACE(ut_copy_epackage_to_ipackage);
 
-        /*
-         * First package at head of the buffer
-         */
-        external_object = (union acpi_object *)buffer;
+        /* Create the package object */
 
-        /*
-         * Free space begins right after the first package
-         */
-        free_space = buffer + sizeof(union acpi_object);
+        package_object =
+            acpi_ut_create_package_object(external_object->package.count);
+        if (!package_object) {
+                return_ACPI_STATUS(AE_NO_MEMORY);
+        }
 
-        external_object->type = ACPI_GET_OBJECT_TYPE(internal_object);
-        external_object->package.count = internal_object->package.count;
-        external_object->package.elements = (union acpi_object *)free_space;
+        package_elements = package_object->package.elements;
 
         /*
-         * Build an array of ACPI_OBJECTS in the buffer
-         * and move the free space past it
+         * Recursive implementation. Probably ok, since nested external packages
+         * as parameters should be very rare.
          */
-        free_space +=
-            external_object->package.count * sizeof(union acpi_object);
+        for (i = 0; i < external_object->package.count; i++) {
+                status =
+                    acpi_ut_copy_eobject_to_iobject(&external_object->package.
+                                                    elements[i],
+                                                    &package_elements[i]);
+                if (ACPI_FAILURE(status)) {
 
-        /* Call walk_package */
+                        /* Truncate package and delete it */
 
-}
+                        package_object->package.count = i;
+                        package_elements[i] = NULL;
+                        acpi_ut_remove_reference(package_object);
+                        return_ACPI_STATUS(status);
+                }
+        }
 
-#endif                          /* Future implementation */
+        *internal_object = package_object;
+        return_ACPI_STATUS(status);
+}
 
 /*******************************************************************************
  *
  * FUNCTION:    acpi_ut_copy_eobject_to_iobject
  *
- * PARAMETERS:  *internal_object   - The external object to be converted
- *              *buffer_ptr     - Where the internal object is returned
+ * PARAMETERS:  external_object     - The external object to be converted
+ *              internal_object     - Where the internal object is returned
  *
- * RETURN:      Status          - the status of the call
+ * RETURN:      Status              - the status of the call
  *
  * DESCRIPTION: Converts an external object to an internal object.
  *
@@ -603,16 +603,10 @@ acpi_ut_copy_eobject_to_iobject(union acpi_object *external_object,
         ACPI_FUNCTION_TRACE(ut_copy_eobject_to_iobject);
 
         if (external_object->type == ACPI_TYPE_PACKAGE) {
-                /*
-                 * Packages as external input to control methods are not supported,
-                 */
-                ACPI_ERROR((AE_INFO,
-                            "Packages as parameters not implemented!"));
-
-                return_ACPI_STATUS(AE_NOT_IMPLEMENTED);
-        }
-
-        else {
+                status =
+                    acpi_ut_copy_epackage_to_ipackage(external_object,
+                                                      internal_object);
+        } else {
                 /*
                  * Build a simple object (no nested objects)
                  */
@@ -803,33 +797,19 @@ acpi_ut_copy_ielement_to_ielement(u8 object_type,
                  * Create and build the package object
                  */
                 target_object =
-                    acpi_ut_create_internal_object(ACPI_TYPE_PACKAGE);
+                    acpi_ut_create_package_object(source_object->package.count);
                 if (!target_object) {
                         return (AE_NO_MEMORY);
                 }
 
-                target_object->package.count = source_object->package.count;
                 target_object->common.flags = source_object->common.flags;
 
-                /*
-                 * Create the object array
-                 */
-                target_object->package.elements =
-                    ACPI_ALLOCATE_ZEROED(((acpi_size) source_object->package.
-                                          count + 1) * sizeof(void *));
-                if (!target_object->package.elements) {
-                        status = AE_NO_MEMORY;
-                        goto error_exit;
-                }
+                /* Pass the new package object back to the package walk routine */
 
-                /*
-                 * Pass the new package object back to the package walk routine
-                 */
                 state->pkg.this_target_obj = target_object;
 
-                /*
-                 * Store the object pointer in the parent package object
-                 */
+                /* Store the object pointer in the parent package object */
+
                 *this_target_ptr = target_object;
                 break;
 
diff --git a/drivers/acpi/utilities/utobject.c b/drivers/acpi/utilities/utobject.c
index 4696124759e1..db0b9bac7945 100644
--- a/drivers/acpi/utilities/utobject.c
+++ b/drivers/acpi/utilities/utobject.c
@@ -146,6 +146,48 @@ union acpi_operand_object *acpi_ut_create_internal_object_dbg(char *module_name,
 
 /*******************************************************************************
  *
+ * FUNCTION:    acpi_ut_create_package_object
+ *
+ * PARAMETERS:  Count               - Number of package elements
+ *
+ * RETURN:      Pointer to a new Package object, null on failure
+ *
+ * DESCRIPTION: Create a fully initialized package object
+ *
+ ******************************************************************************/
+
+union acpi_operand_object *acpi_ut_create_package_object(u32 count)
+{
+        union acpi_operand_object *package_desc;
+        union acpi_operand_object **package_elements;
+
+        ACPI_FUNCTION_TRACE_U32(ut_create_package_object, count);
+
+        /* Create a new Package object */
+
+        package_desc = acpi_ut_create_internal_object(ACPI_TYPE_PACKAGE);
+        if (!package_desc) {
+                return_PTR(NULL);
+        }
+
+        /*
+         * Create the element array. Count+1 allows the array to be null
+         * terminated.
+         */
+        package_elements = ACPI_ALLOCATE_ZEROED((acpi_size)
+                                                (count + 1) * sizeof(void *));
+        if (!package_elements) {
+                ACPI_FREE(package_desc);
+                return_PTR(NULL);
+        }
+
+        package_desc->package.count = count;
+        package_desc->package.elements = package_elements;
+        return_PTR(package_desc);
+}
+
+/*******************************************************************************
+ *
  * FUNCTION:    acpi_ut_create_buffer_object
  *
  * PARAMETERS:  buffer_size            - Size of buffer to be created
diff --git a/include/acpi/acutils.h b/include/acpi/acutils.h
index 15a838862cd4..a87ef1c8d46b 100644
--- a/include/acpi/acutils.h
+++ b/include/acpi/acutils.h
@@ -390,6 +390,8 @@ void acpi_ut_delete_object_desc(union acpi_operand_object *object);
 
 u8 acpi_ut_valid_internal_object(void *object);
 
+union acpi_operand_object *acpi_ut_create_package_object(u32 count);
+
 union acpi_operand_object *acpi_ut_create_buffer_object(acpi_size buffer_size);
 
 union acpi_operand_object *acpi_ut_create_string_object(acpi_size string_size);