ACPI: ACPICA 20060421

Removed a device initialization optimization introduced in
20051216 where the _STA method was not run unless an _INI
was also present for the same device. This optimization
could cause problems because it could allow _INI methods
to be run within a not-present device subtree (If a
not-present device had no _INI, _STA would not be run,
the not-present status would not be discovered, and the
children of the device would be incorrectly traversed.)

Implemented a new _STA optimization where namespace
subtrees that do not contain _INI are identified and
ignored during device initialization. Selectively running
_STA can significantly improve boot time on large machines
(with assistance from Len Brown.)

Implemented support for the device initialization case
where the returned _STA flags indicate a device not-present
but functioning. In this case, _INI is not run, but the
device children are examined for presence, as per the
ACPI specification.

Implemented an additional change to the IndexField support
in order to conform to MS behavior. The value written to
the Index Register is not simply a byte offset, it is a
byte offset in units of the access width of the parent
Index Field. (Fiodor Suietov)

Defined and deployed a new OSL interface,
acpi_os_validate_address().  This interface is called during
the creation of all AML operation regions, and allows
the host OS to exert control over what addresses it will
allow the AML code to access. Operation Regions whose
addresses are disallowed will cause a runtime exception
when they are actually accessed (will not affect or abort
table loading.)

Defined and deployed a new OSL interface,
acpi_os_validate_interface().  This interface allows the host OS
to match the various "optional" interface/behavior strings
for the _OSI predefined control method as appropriate
(with assistance from Bjorn Helgaas.)

Restructured and corrected various problems in the
exception handling code paths within DsCallControlMethod
and DsTerminateControlMethod in dsmethod (with assistance
from Takayoshi Kochi.)

Modified the Linux source converter to ignore quoted string
literals while converting identifiers from mixed to lower
case. This will correct problems with the disassembler
and other areas where such strings must not be modified.

The ACPI_FUNCTION_* macros no longer require quotes around
the function name. This allows the Linux source converter
to convert the names, now that the converter ignores
quoted strings.

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

1 files changed, 102 insertions, 78 deletions

diff --git a/drivers/acpi/dispatcher/dsmethod.c b/drivers/acpi/dispatcher/dsmethod.c
index 7dc59fc7344f..651f2b68531b 100644
--- a/drivers/acpi/dispatcher/dsmethod.c
+++ b/drivers/acpi/dispatcher/dsmethod.c
@@ -134,7 +134,7 @@ acpi_ds_begin_method_execution(struct acpi_namespace_node * method_node,
 {
 	acpi_status status = AE_OK;
 
-	ACPI_FUNCTION_TRACE_PTR("ds_begin_method_execution", method_node);
+	ACPI_FUNCTION_TRACE_PTR(ds_begin_method_execution, method_node);
 
 	if (!method_node) {
 		return_ACPI_STATUS(AE_NULL_ENTRY);
@@ -170,11 +170,14 @@ acpi_ds_begin_method_execution(struct acpi_namespace_node * method_node,
 
 		/*
 		 * Get a unit from the method semaphore. This releases the
-		 * interpreter if we block
+		 * interpreter if we block (then reacquires it)
 		 */
 		status =
 		    acpi_ex_system_wait_semaphore(obj_desc->method.semaphore,
 						  ACPI_WAIT_FOREVER);
+		if (ACPI_FAILURE(status)) {
+			return_ACPI_STATUS(status);
+		}
 	}
 
 	/*
@@ -185,7 +188,7 @@ acpi_ds_begin_method_execution(struct acpi_namespace_node * method_node,
 	if (!obj_desc->method.owner_id) {
 		status = acpi_ut_allocate_owner_id(&obj_desc->method.owner_id);
 		if (ACPI_FAILURE(status)) {
-			return_ACPI_STATUS(status);
+			goto cleanup;
 		}
 	}
 
@@ -195,6 +198,14 @@ acpi_ds_begin_method_execution(struct acpi_namespace_node * method_node,
 	 */
 	obj_desc->method.thread_count++;
 	return_ACPI_STATUS(status);
+
+      cleanup:
+	/* On error, must signal the method semaphore if present */
+
+	if (obj_desc->method.semaphore) {
+		(void)acpi_os_signal_semaphore(obj_desc->method.semaphore, 1);
+	}
+	return_ACPI_STATUS(status);
 }
 
 /*******************************************************************************
@@ -223,7 +234,7 @@ acpi_ds_call_control_method(struct acpi_thread_state *thread,
 	struct acpi_parameter_info info;
 	u32 i;
 
-	ACPI_FUNCTION_TRACE_PTR("ds_call_control_method", this_walk_state);
+	ACPI_FUNCTION_TRACE_PTR(ds_call_control_method, this_walk_state);
 
 	ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 			  "Execute method %p, currentstate=%p\n",
@@ -242,26 +253,31 @@ acpi_ds_call_control_method(struct acpi_thread_state *thread,
 		return_ACPI_STATUS(AE_NULL_OBJECT);
 	}
 
-	/* Init for new method, wait on concurrency semaphore */
+	/* Init for new method, possibly wait on concurrency semaphore */
 
 	status = acpi_ds_begin_method_execution(method_node, obj_desc,
 						this_walk_state->method_node);
 	if (ACPI_FAILURE(status)) {
-		goto cleanup;
+		return_ACPI_STATUS(status);
 	}
 
+	/*
+	 * 1) Parse the method. All "normal" methods are parsed for each execution.
+	 * Internal methods (_OSI, etc.) do not require parsing.
+	 */
 	if (!(obj_desc->method.method_flags & AML_METHOD_INTERNAL_ONLY)) {
 
-		/* 1) Parse: Create a new walk state for the preempting walk */
+		/* Create a new walk state for the parse */
 
 		next_walk_state =
 		    acpi_ds_create_walk_state(obj_desc->method.owner_id, op,
 					      obj_desc, NULL);
 		if (!next_walk_state) {
-			return_ACPI_STATUS(AE_NO_MEMORY);
+			status = AE_NO_MEMORY;
+			goto cleanup;
 		}
 
-		/* Create and init a Root Node */
+		/* Create and init a parse tree root */
 
 		op = acpi_ps_create_scope_op();
 		if (!op) {
@@ -274,17 +290,20 @@ acpi_ds_call_control_method(struct acpi_thread_state *thread,
 					       obj_desc->method.aml_length,
 					       NULL, 1);
 		if (ACPI_FAILURE(status)) {
-			acpi_ds_delete_walk_state(next_walk_state);
+			acpi_ps_delete_parse_tree(op);
 			goto cleanup;
 		}
 
-		/* Begin AML parse */
+		/* Begin AML parse (deletes next_walk_state) */
 
 		status = acpi_ps_parse_aml(next_walk_state);
 		acpi_ps_delete_parse_tree(op);
+		if (ACPI_FAILURE(status)) {
+			goto cleanup;
+		}
 	}
 
-	/* 2) Execute: Create a new state for the preempting walk */
+	/* 2) Begin method execution. Create a new walk state */
 
 	next_walk_state = acpi_ds_create_walk_state(obj_desc->method.owner_id,
 						    NULL, obj_desc, thread);
@@ -292,6 +311,7 @@ acpi_ds_call_control_method(struct acpi_thread_state *thread,
 		status = AE_NO_MEMORY;
 		goto cleanup;
 	}
+
 	/*
 	 * The resolved arguments were put on the previous walk state's operand
 	 * stack. Operands on the previous walk state stack always
@@ -326,6 +346,8 @@ acpi_ds_call_control_method(struct acpi_thread_state *thread,
 			  "Starting nested execution, newstate=%p\n",
 			  next_walk_state));
 
+	/* Invoke an internal method if necessary */
+
 	if (obj_desc->method.method_flags & AML_METHOD_INTERNAL_ONLY) {
 		status = obj_desc->method.implementation(next_walk_state);
 	}
@@ -333,16 +355,14 @@ acpi_ds_call_control_method(struct acpi_thread_state *thread,
 	return_ACPI_STATUS(status);
 
       cleanup:
-	/* Decrement the thread count on the method parse tree */
 
-	if (next_walk_state && (next_walk_state->method_desc)) {
-		next_walk_state->method_desc->method.thread_count--;
-	}
+	/* On error, we must terminate the method properly */
 
-	/* On error, we must delete the new walk state */
+	acpi_ds_terminate_control_method(obj_desc, next_walk_state);
+	if (next_walk_state) {
+		acpi_ds_delete_walk_state(next_walk_state);
+	}
 
-	acpi_ds_terminate_control_method(next_walk_state);
-	acpi_ds_delete_walk_state(next_walk_state);
 	return_ACPI_STATUS(status);
 }
 
@@ -366,15 +386,15 @@ acpi_ds_restart_control_method(struct acpi_walk_state *walk_state,
 {
 	acpi_status status;
 
-	ACPI_FUNCTION_TRACE_PTR("ds_restart_control_method", walk_state);
+	ACPI_FUNCTION_TRACE_PTR(ds_restart_control_method, walk_state);
 
 	ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
-			  "****Restart [%4.4s] Op %p return_value_from_callee %p\n",
+			  "****Restart [%4.4s] Op %p ReturnValueFromCallee %p\n",
 			  (char *)&walk_state->method_node->name,
 			  walk_state->method_call_op, return_desc));
 
 	ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
-			  "    return_from_this_method_used?=%X res_stack %p Walk %p\n",
+			  "    ReturnFromThisMethodUsed?=%X ResStack %p Walk %p\n",
 			  walk_state->return_used,
 			  walk_state->results, walk_state));
 
@@ -426,7 +446,8 @@ acpi_ds_restart_control_method(struct acpi_walk_state *walk_state,
  *
  * FUNCTION:    acpi_ds_terminate_control_method
  *
- * PARAMETERS:  walk_state          - State of the method
+ * PARAMETERS:  method_desc         - Method object
+ *              walk_state          - State associated with the method
  *
  * RETURN:      None
  *
@@ -436,28 +457,27 @@ acpi_ds_restart_control_method(struct acpi_walk_state *walk_state,
  *
  ******************************************************************************/
 
-void acpi_ds_terminate_control_method(struct acpi_walk_state *walk_state)
+void
+acpi_ds_terminate_control_method(union acpi_operand_object *method_desc,
+				 struct acpi_walk_state *walk_state)
 {
-	union acpi_operand_object *obj_desc;
 	struct acpi_namespace_node *method_node;
 	acpi_status status;
 
-	ACPI_FUNCTION_TRACE_PTR("ds_terminate_control_method", walk_state);
-
-	if (!walk_state) {
-		return_VOID;
-	}
+	ACPI_FUNCTION_TRACE_PTR(ds_terminate_control_method, walk_state);
 
-	/* The current method object was saved in the walk state */
+	/* method_desc is required, walk_state is optional */
 
-	obj_desc = walk_state->method_desc;
-	if (!obj_desc) {
+	if (!method_desc) {
 		return_VOID;
 	}
 
-	/* Delete all arguments and locals */
+	if (walk_state) {
 
-	acpi_ds_method_data_delete_all(walk_state);
+		/* Delete all arguments and locals */
+
+		acpi_ds_method_data_delete_all(walk_state);
+	}
 
 	/*
 	 * Lock the parser while we terminate this method.
@@ -471,60 +491,66 @@ void acpi_ds_terminate_control_method(struct acpi_walk_state *walk_state)
 
 	/* Signal completion of the execution of this method if necessary */
 
-	if (walk_state->method_desc->method.semaphore) {
+	if (method_desc->method.semaphore) {
 		status =
-		    acpi_os_signal_semaphore(walk_state->method_desc->method.
-					     semaphore, 1);
+		    acpi_os_signal_semaphore(method_desc->method.semaphore, 1);
 		if (ACPI_FAILURE(status)) {
-			ACPI_ERROR((AE_INFO,
-				    "Could not signal method semaphore"));
 
-			/* Ignore error and continue cleanup */
+			/* Ignore error and continue */
+
+			ACPI_EXCEPTION((AE_INFO, status,
+					"Could not signal method semaphore"));
 		}
 	}
 
-	/*
-	 * There are no more threads executing this method.  Perform
-	 * additional cleanup.
-	 *
-	 * The method Node is stored in the walk state
-	 */
-	method_node = walk_state->method_node;
+	if (walk_state) {
+		/*
+		 * Delete any objects created by this method during execution.
+		 * The method Node is stored in the walk state
+		 */
+		method_node = walk_state->method_node;
 
-	/* Lock namespace for possible update */
+		/* Lock namespace for possible update */
 
-	status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
-	if (ACPI_FAILURE(status)) {
-		goto exit;
-	}
+		status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
+		if (ACPI_FAILURE(status)) {
+			goto exit;
+		}
 
-	/*
-	 * Delete any namespace entries created immediately underneath
-	 * the method
-	 */
-	if (method_node && method_node->child) {
-		acpi_ns_delete_namespace_subtree(method_node);
+		/*
+		 * Delete any namespace entries created immediately underneath
+		 * the method
+		 */
+		if (method_node && method_node->child) {
+			acpi_ns_delete_namespace_subtree(method_node);
+		}
+
+		/*
+		 * Delete any namespace entries created anywhere else within
+		 * the namespace by the execution of this method
+		 */
+		acpi_ns_delete_namespace_by_owner(method_desc->method.owner_id);
+		status = acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 	}
 
-	/*
-	 * Delete any namespace entries created anywhere else within
-	 * the namespace by the execution of this method
-	 */
-	acpi_ns_delete_namespace_by_owner(walk_state->method_desc->method.
-					  owner_id);
-	status = acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
+	/* Decrement the thread count on the method */
+
+	if (method_desc->method.thread_count) {
+		method_desc->method.thread_count--;
+	} else {
+		ACPI_ERROR((AE_INFO, "Invalid zero thread count in method"));
+	}
 
 	/* Are there any other threads currently executing this method? */
 
-	if (walk_state->method_desc->method.thread_count) {
+	if (method_desc->method.thread_count) {
 		/*
 		 * Additional threads. Do not release the owner_id in this case,
 		 * we immediately reuse it for the next thread executing this method
 		 */
 		ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 				  "*** Completed execution of one thread, %d threads remaining\n",
-				  walk_state->method_desc->method.
-				  thread_count));
+				  method_desc->method.thread_count));
 	} else {
 		/* This is the only executing thread for this method */
 
@@ -538,18 +564,16 @@ void acpi_ds_terminate_control_method(struct acpi_walk_state *walk_state)
 		 * This code is here because we must wait until the last thread exits
 		 * before creating the synchronization semaphore.
 		 */
-		if ((walk_state->method_desc->method.concurrency == 1) &&
-		    (!walk_state->method_desc->method.semaphore)) {
+		if ((method_desc->method.concurrency == 1) &&
+		    (!method_desc->method.semaphore)) {
 			status = acpi_os_create_semaphore(1, 1,
-							  &walk_state->
-							  method_desc->method.
+							  &method_desc->method.
 							  semaphore);
 		}
 
 		/* No more threads, we can free the owner_id */
 
-		acpi_ut_release_owner_id(&walk_state->method_desc->method.
-					 owner_id);
+		acpi_ut_release_owner_id(&method_desc->method.owner_id);
 	}
 
       exit:
@@ -586,7 +610,7 @@ acpi_status acpi_ds_parse_method(struct acpi_namespace_node *node)
 	union acpi_parse_object *op;
 	struct acpi_walk_state *walk_state;
 
-	ACPI_FUNCTION_TRACE_PTR("ds_parse_method", node);
+	ACPI_FUNCTION_TRACE_PTR(ds_parse_method, node);
 
 	/* Parameter Validation */
 
@@ -595,7 +619,7 @@ acpi_status acpi_ds_parse_method(struct acpi_namespace_node *node)
 	}
 
 	ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
-			  "**** Parsing [%4.4s] **** named_obj=%p\n",
+			  "**** Parsing [%4.4s] **** NamedObj=%p\n",
 			  acpi_ut_get_node_name(node), node));
 
 	/* Extract the method object from the method Node */
@@ -674,7 +698,7 @@ acpi_status acpi_ds_parse_method(struct acpi_namespace_node *node)
 	}
 
 	ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
-			  "**** [%4.4s] Parsed **** named_obj=%p Op=%p\n",
+			  "**** [%4.4s] Parsed **** NamedObj=%p Op=%p\n",
 			  acpi_ut_get_node_name(node), node, op));
 
 	/*