Initial import

1 files changed, 755 insertions, 0 deletions

diff --git a/drivers/acpi/acpica/utdelete.c b/drivers/acpi/acpica/utdelete.c
new file mode 100644
index 000000000..71fce389f
--- /dev/null
+++ b/drivers/acpi/acpica/utdelete.c
@@ -0,0 +1,755 @@
+/*******************************************************************************
+ *
+ * Module Name: utdelete - object deletion and reference count utilities
+ *
+ ******************************************************************************/
+
+/*
+ * Copyright (C) 2000 - 2015, 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 "acinterp.h"
+#include "acnamesp.h"
+#include "acevents.h"
+
+#define _COMPONENT          ACPI_UTILITIES
+ACPI_MODULE_NAME("utdelete")
+
+/* Local prototypes */
+static void acpi_ut_delete_internal_obj(union acpi_operand_object *object);
+
+static void
+acpi_ut_update_ref_count(union acpi_operand_object *object, u32 action);
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ut_delete_internal_obj
+ *
+ * PARAMETERS:  object         - Object to be deleted
+ *
+ * RETURN:      None
+ *
+ * DESCRIPTION: Low level object deletion, after reference counts have been
+ *              updated (All reference counts, including sub-objects!)
+ *
+ ******************************************************************************/
+
+static void acpi_ut_delete_internal_obj(union acpi_operand_object *object)
+{
+	void *obj_pointer = NULL;
+	union acpi_operand_object *handler_desc;
+	union acpi_operand_object *second_desc;
+	union acpi_operand_object *next_desc;
+	union acpi_operand_object *start_desc;
+	union acpi_operand_object **last_obj_ptr;
+
+	ACPI_FUNCTION_TRACE_PTR(ut_delete_internal_obj, object);
+
+	if (!object) {
+		return_VOID;
+	}
+
+	/*
+	 * Must delete or free any pointers within the object that are not
+	 * actual ACPI objects (for example, a raw buffer pointer).
+	 */
+	switch (object->common.type) {
+	case ACPI_TYPE_STRING:
+
+		ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
+				  "**** String %p, ptr %p\n", object,
+				  object->string.pointer));
+
+		/* Free the actual string buffer */
+
+		if (!(object->common.flags & AOPOBJ_STATIC_POINTER)) {
+
+			/* But only if it is NOT a pointer into an ACPI table */
+
+			obj_pointer = object->string.pointer;
+		}
+		break;
+
+	case ACPI_TYPE_BUFFER:
+
+		ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
+				  "**** Buffer %p, ptr %p\n", object,
+				  object->buffer.pointer));
+
+		/* Free the actual buffer */
+
+		if (!(object->common.flags & AOPOBJ_STATIC_POINTER)) {
+
+			/* But only if it is NOT a pointer into an ACPI table */
+
+			obj_pointer = object->buffer.pointer;
+		}
+		break;
+
+	case ACPI_TYPE_PACKAGE:
+
+		ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
+				  " **** Package of count %X\n",
+				  object->package.count));
+
+		/*
+		 * Elements of the package are not handled here, they are deleted
+		 * separately
+		 */
+
+		/* Free the (variable length) element pointer array */
+
+		obj_pointer = object->package.elements;
+		break;
+
+		/*
+		 * These objects have a possible list of notify handlers.
+		 * Device object also may have a GPE block.
+		 */
+	case ACPI_TYPE_DEVICE:
+
+		if (object->device.gpe_block) {
+			(void)acpi_ev_delete_gpe_block(object->device.
+						       gpe_block);
+		}
+
+		/*lint -fallthrough */
+
+	case ACPI_TYPE_PROCESSOR:
+	case ACPI_TYPE_THERMAL:
+
+		/* Walk the address handler list for this object */
+
+		handler_desc = object->common_notify.handler;
+		while (handler_desc) {
+			next_desc = handler_desc->address_space.next;
+			acpi_ut_remove_reference(handler_desc);
+			handler_desc = next_desc;
+		}
+		break;
+
+	case ACPI_TYPE_MUTEX:
+
+		ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
+				  "***** Mutex %p, OS Mutex %p\n",
+				  object, object->mutex.os_mutex));
+
+		if (object == acpi_gbl_global_lock_mutex) {
+
+			/* Global Lock has extra semaphore */
+
+			(void)
+			    acpi_os_delete_semaphore
+			    (acpi_gbl_global_lock_semaphore);
+			acpi_gbl_global_lock_semaphore = NULL;
+
+			acpi_os_delete_mutex(object->mutex.os_mutex);
+			acpi_gbl_global_lock_mutex = NULL;
+		} else {
+			acpi_ex_unlink_mutex(object);
+			acpi_os_delete_mutex(object->mutex.os_mutex);
+		}
+		break;
+
+	case ACPI_TYPE_EVENT:
+
+		ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
+				  "***** Event %p, OS Semaphore %p\n",
+				  object, object->event.os_semaphore));
+
+		(void)acpi_os_delete_semaphore(object->event.os_semaphore);
+		object->event.os_semaphore = NULL;
+		break;
+
+	case ACPI_TYPE_METHOD:
+
+		ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
+				  "***** Method %p\n", object));
+
+		/* Delete the method mutex if it exists */
+
+		if (object->method.mutex) {
+			acpi_os_delete_mutex(object->method.mutex->mutex.
+					     os_mutex);
+			acpi_ut_delete_object_desc(object->method.mutex);
+			object->method.mutex = NULL;
+		}
+		break;
+
+	case ACPI_TYPE_REGION:
+
+		ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
+				  "***** Region %p\n", object));
+
+		/*
+		 * Update address_range list. However, only permanent regions
+		 * are installed in this list. (Not created within a method)
+		 */
+		if (!(object->region.node->flags & ANOBJ_TEMPORARY)) {
+			acpi_ut_remove_address_range(object->region.space_id,
+						     object->region.node);
+		}
+
+		second_desc = acpi_ns_get_secondary_object(object);
+		if (second_desc) {
+			/*
+			 * Free the region_context if and only if the handler is one of the
+			 * default handlers -- and therefore, we created the context object
+			 * locally, it was not created by an external caller.
+			 */
+			handler_desc = object->region.handler;
+			if (handler_desc) {
+				next_desc =
+				    handler_desc->address_space.region_list;
+				start_desc = next_desc;
+				last_obj_ptr =
+				    &handler_desc->address_space.region_list;
+
+				/* Remove the region object from the handler list */
+
+				while (next_desc) {
+					if (next_desc == object) {
+						*last_obj_ptr =
+						    next_desc->region.next;
+						break;
+					}
+
+					/* Walk the linked list of handlers */
+
+					last_obj_ptr = &next_desc->region.next;
+					next_desc = next_desc->region.next;
+
+					/* Prevent infinite loop if list is corrupted */
+
+					if (next_desc == start_desc) {
+						ACPI_ERROR((AE_INFO,
+							    "Circular region list in address handler object %p",
+							    handler_desc));
+						return_VOID;
+					}
+				}
+
+				if (handler_desc->address_space.handler_flags &
+				    ACPI_ADDR_HANDLER_DEFAULT_INSTALLED) {
+
+					/* Deactivate region and free region context */
+
+					if (handler_desc->address_space.setup) {
+						(void)handler_desc->
+						    address_space.setup(object,
+									ACPI_REGION_DEACTIVATE,
+									handler_desc->
+									address_space.
+									context,
+									&second_desc->
+									extra.
+									region_context);
+					}
+				}
+
+				acpi_ut_remove_reference(handler_desc);
+			}
+
+			/* Now we can free the Extra object */
+
+			acpi_ut_delete_object_desc(second_desc);
+		}
+		break;
+
+	case ACPI_TYPE_BUFFER_FIELD:
+
+		ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
+				  "***** Buffer Field %p\n", object));
+
+		second_desc = acpi_ns_get_secondary_object(object);
+		if (second_desc) {
+			acpi_ut_delete_object_desc(second_desc);
+		}
+		break;
+
+	case ACPI_TYPE_LOCAL_BANK_FIELD:
+
+		ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
+				  "***** Bank Field %p\n", object));
+
+		second_desc = acpi_ns_get_secondary_object(object);
+		if (second_desc) {
+			acpi_ut_delete_object_desc(second_desc);
+		}
+		break;
+
+	default:
+
+		break;
+	}
+
+	/* Free any allocated memory (pointer within the object) found above */
+
+	if (obj_pointer) {
+		ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
+				  "Deleting Object Subptr %p\n", obj_pointer));
+		ACPI_FREE(obj_pointer);
+	}
+
+	/* Now the object can be safely deleted */
+
+	ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS, "Deleting Object %p [%s]\n",
+			  object, acpi_ut_get_object_type_name(object)));
+
+	acpi_ut_delete_object_desc(object);
+	return_VOID;
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ut_delete_internal_object_list
+ *
+ * PARAMETERS:  obj_list        - Pointer to the list to be deleted
+ *
+ * RETURN:      None
+ *
+ * DESCRIPTION: This function deletes an internal object list, including both
+ *              simple objects and package objects
+ *
+ ******************************************************************************/
+
+void acpi_ut_delete_internal_object_list(union acpi_operand_object **obj_list)
+{
+	union acpi_operand_object **internal_obj;
+
+	ACPI_FUNCTION_ENTRY();
+
+	/* Walk the null-terminated internal list */
+
+	for (internal_obj = obj_list; *internal_obj; internal_obj++) {
+		acpi_ut_remove_reference(*internal_obj);
+	}
+
+	/* Free the combined parameter pointer list and object array */
+
+	ACPI_FREE(obj_list);
+	return;
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ut_update_ref_count
+ *
+ * PARAMETERS:  object          - Object whose ref count is to be updated
+ *              action          - What to do (REF_INCREMENT or REF_DECREMENT)
+ *
+ * RETURN:      None. Sets new reference count within the object
+ *
+ * DESCRIPTION: Modify the reference count for an internal acpi object
+ *
+ ******************************************************************************/
+
+static void
+acpi_ut_update_ref_count(union acpi_operand_object *object, u32 action)
+{
+	u16 original_count;
+	u16 new_count = 0;
+	acpi_cpu_flags lock_flags;
+
+	ACPI_FUNCTION_NAME(ut_update_ref_count);
+
+	if (!object) {
+		return;
+	}
+
+	/*
+	 * Always get the reference count lock. Note: Interpreter and/or
+	 * Namespace is not always locked when this function is called.
+	 */
+	lock_flags = acpi_os_acquire_lock(acpi_gbl_reference_count_lock);
+	original_count = object->common.reference_count;
+
+	/* Perform the reference count action (increment, decrement) */
+
+	switch (action) {
+	case REF_INCREMENT:
+
+		new_count = original_count + 1;
+		object->common.reference_count = new_count;
+		acpi_os_release_lock(acpi_gbl_reference_count_lock, lock_flags);
+
+		/* The current reference count should never be zero here */
+
+		if (!original_count) {
+			ACPI_WARNING((AE_INFO,
+				      "Obj %p, Reference Count was zero before increment\n",
+				      object));
+		}
+
+		ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
+				  "Obj %p Type %.2X Refs %.2X [Incremented]\n",
+				  object, object->common.type, new_count));
+		break;
+
+	case REF_DECREMENT:
+
+		/* The current reference count must be non-zero */
+
+		if (original_count) {
+			new_count = original_count - 1;
+			object->common.reference_count = new_count;
+		}
+
+		acpi_os_release_lock(acpi_gbl_reference_count_lock, lock_flags);
+
+		if (!original_count) {
+			ACPI_WARNING((AE_INFO,
+				      "Obj %p, Reference Count is already zero, cannot decrement\n",
+				      object));
+		}
+
+		ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
+				  "Obj %p Type %.2X Refs %.2X [Decremented]\n",
+				  object, object->common.type, new_count));
+
+		/* Actually delete the object on a reference count of zero */
+
+		if (new_count == 0) {
+			acpi_ut_delete_internal_obj(object);
+		}
+		break;
+
+	default:
+
+		acpi_os_release_lock(acpi_gbl_reference_count_lock, lock_flags);
+		ACPI_ERROR((AE_INFO, "Unknown Reference Count action (0x%X)",
+			    action));
+		return;
+	}
+
+	/*
+	 * Sanity check the reference count, for debug purposes only.
+	 * (A deleted object will have a huge reference count)
+	 */
+	if (new_count > ACPI_MAX_REFERENCE_COUNT) {
+		ACPI_WARNING((AE_INFO,
+			      "Large Reference Count (0x%X) in object %p, Type=0x%.2X",
+			      new_count, object, object->common.type));
+	}
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ut_update_object_reference
+ *
+ * PARAMETERS:  object              - Increment ref count for this object
+ *                                    and all sub-objects
+ *              action              - Either REF_INCREMENT or REF_DECREMENT
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Increment the object reference count
+ *
+ * Object references are incremented when:
+ * 1) An object is attached to a Node (namespace object)
+ * 2) An object is copied (all subobjects must be incremented)
+ *
+ * Object references are decremented when:
+ * 1) An object is detached from an Node
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ut_update_object_reference(union acpi_operand_object *object, u16 action)
+{
+	acpi_status status = AE_OK;
+	union acpi_generic_state *state_list = NULL;
+	union acpi_operand_object *next_object = NULL;
+	union acpi_operand_object *prev_object;
+	union acpi_generic_state *state;
+	u32 i;
+
+	ACPI_FUNCTION_NAME(ut_update_object_reference);
+
+	while (object) {
+
+		/* Make sure that this isn't a namespace handle */
+
+		if (ACPI_GET_DESCRIPTOR_TYPE(object) == ACPI_DESC_TYPE_NAMED) {
+			ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
+					  "Object %p is NS handle\n", object));
+			return (AE_OK);
+		}
+
+		/*
+		 * All sub-objects must have their reference count incremented also.
+		 * Different object types have different subobjects.
+		 */
+		switch (object->common.type) {
+		case ACPI_TYPE_DEVICE:
+		case ACPI_TYPE_PROCESSOR:
+		case ACPI_TYPE_POWER:
+		case ACPI_TYPE_THERMAL:
+			/*
+			 * Update the notify objects for these types (if present)
+			 * Two lists, system and device notify handlers.
+			 */
+			for (i = 0; i < ACPI_NUM_NOTIFY_TYPES; i++) {
+				prev_object =
+				    object->common_notify.notify_list[i];
+				while (prev_object) {
+					next_object =
+					    prev_object->notify.next[i];
+					acpi_ut_update_ref_count(prev_object,
+								 action);
+					prev_object = next_object;
+				}
+			}
+			break;
+
+		case ACPI_TYPE_PACKAGE:
+			/*
+			 * We must update all the sub-objects of the package,
+			 * each of whom may have their own sub-objects.
+			 */
+			for (i = 0; i < object->package.count; i++) {
+				/*
+				 * Null package elements are legal and can be simply
+				 * ignored.
+				 */
+				next_object = object->package.elements[i];
+				if (!next_object) {
+					continue;
+				}
+
+				switch (next_object->common.type) {
+				case ACPI_TYPE_INTEGER:
+				case ACPI_TYPE_STRING:
+				case ACPI_TYPE_BUFFER:
+					/*
+					 * For these very simple sub-objects, we can just
+					 * update the reference count here and continue.
+					 * Greatly increases performance of this operation.
+					 */
+					acpi_ut_update_ref_count(next_object,
+								 action);
+					break;
+
+				default:
+					/*
+					 * For complex sub-objects, push them onto the stack
+					 * for later processing (this eliminates recursion.)
+					 */
+					status =
+					    acpi_ut_create_update_state_and_push
+					    (next_object, action, &state_list);
+					if (ACPI_FAILURE(status)) {
+						goto error_exit;
+					}
+					break;
+				}
+			}
+			next_object = NULL;
+			break;
+
+		case ACPI_TYPE_BUFFER_FIELD:
+
+			next_object = object->buffer_field.buffer_obj;
+			break;
+
+		case ACPI_TYPE_LOCAL_REGION_FIELD:
+
+			next_object = object->field.region_obj;
+			break;
+
+		case ACPI_TYPE_LOCAL_BANK_FIELD:
+
+			next_object = object->bank_field.bank_obj;
+			status =
+			    acpi_ut_create_update_state_and_push(object->
+								 bank_field.
+								 region_obj,
+								 action,
+								 &state_list);
+			if (ACPI_FAILURE(status)) {
+				goto error_exit;
+			}
+			break;
+
+		case ACPI_TYPE_LOCAL_INDEX_FIELD:
+
+			next_object = object->index_field.index_obj;
+			status =
+			    acpi_ut_create_update_state_and_push(object->
+								 index_field.
+								 data_obj,
+								 action,
+								 &state_list);
+			if (ACPI_FAILURE(status)) {
+				goto error_exit;
+			}
+			break;
+
+		case ACPI_TYPE_LOCAL_REFERENCE:
+			/*
+			 * The target of an Index (a package, string, or buffer) or a named
+			 * reference must track changes to the ref count of the index or
+			 * target object.
+			 */
+			if ((object->reference.class == ACPI_REFCLASS_INDEX) ||
+			    (object->reference.class == ACPI_REFCLASS_NAME)) {
+				next_object = object->reference.object;
+			}
+			break;
+
+		case ACPI_TYPE_REGION:
+		default:
+
+			break;	/* No subobjects for all other types */
+		}
+
+		/*
+		 * Now we can update the count in the main object. This can only
+		 * happen after we update the sub-objects in case this causes the
+		 * main object to be deleted.
+		 */
+		acpi_ut_update_ref_count(object, action);
+		object = NULL;
+
+		/* Move on to the next object to be updated */
+
+		if (next_object) {
+			object = next_object;
+			next_object = NULL;
+		} else if (state_list) {
+			state = acpi_ut_pop_generic_state(&state_list);
+			object = state->update.object;
+			acpi_ut_delete_generic_state(state);
+		}
+	}
+
+	return (AE_OK);
+
+error_exit:
+
+	ACPI_EXCEPTION((AE_INFO, status,
+			"Could not update object reference count"));
+
+	/* Free any stacked Update State objects */
+
+	while (state_list) {
+		state = acpi_ut_pop_generic_state(&state_list);
+		acpi_ut_delete_generic_state(state);
+	}
+
+	return (status);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ut_add_reference
+ *
+ * PARAMETERS:  object          - Object whose reference count is to be
+ *                                incremented
+ *
+ * RETURN:      None
+ *
+ * DESCRIPTION: Add one reference to an ACPI object
+ *
+ ******************************************************************************/
+
+void acpi_ut_add_reference(union acpi_operand_object *object)
+{
+
+	ACPI_FUNCTION_NAME(ut_add_reference);
+
+	/* Ensure that we have a valid object */
+
+	if (!acpi_ut_valid_internal_object(object)) {
+		return;
+	}
+
+	ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
+			  "Obj %p Current Refs=%X [To Be Incremented]\n",
+			  object, object->common.reference_count));
+
+	/* Increment the reference count */
+
+	(void)acpi_ut_update_object_reference(object, REF_INCREMENT);
+	return;
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ut_remove_reference
+ *
+ * PARAMETERS:  object         - Object whose ref count will be decremented
+ *
+ * RETURN:      None
+ *
+ * DESCRIPTION: Decrement the reference count of an ACPI internal object
+ *
+ ******************************************************************************/
+
+void acpi_ut_remove_reference(union acpi_operand_object *object)
+{
+
+	ACPI_FUNCTION_NAME(ut_remove_reference);
+
+	/*
+	 * Allow a NULL pointer to be passed in, just ignore it. This saves
+	 * each caller from having to check. Also, ignore NS nodes.
+	 */
+	if (!object ||
+	    (ACPI_GET_DESCRIPTOR_TYPE(object) == ACPI_DESC_TYPE_NAMED)) {
+		return;
+	}
+
+	/* Ensure that we have a valid object */
+
+	if (!acpi_ut_valid_internal_object(object)) {
+		return;
+	}
+
+	ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
+			  "Obj %p Current Refs=%X [To Be Decremented]\n",
+			  object, object->common.reference_count));
+
+	/*
+	 * Decrement the reference count, and only actually delete the object
+	 * if the reference count becomes 0. (Must also decrement the ref count
+	 * of all subobjects!)
+	 */
+	(void)acpi_ut_update_object_reference(object, REF_DECREMENT);
+	return;
+}