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authorJung-uk Kim <jkim@FreeBSD.org>2014-02-17 17:10:41 +0000
committerJung-uk Kim <jkim@FreeBSD.org>2014-02-17 17:10:41 +0000
commit526d99544ba42a5a2155021975b3b97da425819e (patch)
treef33eb960cbd87cb5fa516e45153eb6351dc8ea2e /source/components/dispatcher/dsmethod.c
parent7bf0bd8c239ae7e6cb5c98382db85377146519d6 (diff)
Notes
Diffstat (limited to 'source/components/dispatcher/dsmethod.c')
-rw-r--r--source/components/dispatcher/dsmethod.c139
1 files changed, 139 insertions, 0 deletions
diff --git a/source/components/dispatcher/dsmethod.c b/source/components/dispatcher/dsmethod.c
index 3fb2135fa887..5cefb4fbb627 100644
--- a/source/components/dispatcher/dsmethod.c
+++ b/source/components/dispatcher/dsmethod.c
@@ -49,6 +49,8 @@
#include "acinterp.h"
#include "acnamesp.h"
#include "acdisasm.h"
+#include "acparser.h"
+#include "amlcode.h"
#define _COMPONENT ACPI_DISPATCHER
@@ -57,12 +59,149 @@
/* Local prototypes */
static ACPI_STATUS
+AcpiDsDetectNamedOpcodes (
+ ACPI_WALK_STATE *WalkState,
+ ACPI_PARSE_OBJECT **OutOp);
+
+static ACPI_STATUS
AcpiDsCreateMethodMutex (
ACPI_OPERAND_OBJECT *MethodDesc);
/*******************************************************************************
*
+ * FUNCTION: AcpiDsAutoSerializeMethod
+ *
+ * PARAMETERS: Node - Namespace Node of the method
+ * ObjDesc - Method object attached to node
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Parse a control method AML to scan for control methods that
+ * need serialization due to the creation of named objects.
+ *
+ * NOTE: It is a bit of overkill to mark all such methods serialized, since
+ * there is only a problem if the method actually blocks during execution.
+ * A blocking operation is, for example, a Sleep() operation, or any access
+ * to an operation region. However, it is probably not possible to easily
+ * detect whether a method will block or not, so we simply mark all suspicious
+ * methods as serialized.
+ *
+ * NOTE2: This code is essentially a generic routine for parsing a single
+ * control method.
+ *
+ ******************************************************************************/
+
+ACPI_STATUS
+AcpiDsAutoSerializeMethod (
+ ACPI_NAMESPACE_NODE *Node,
+ ACPI_OPERAND_OBJECT *ObjDesc)
+{
+ ACPI_STATUS Status;
+ ACPI_PARSE_OBJECT *Op = NULL;
+ ACPI_WALK_STATE *WalkState;
+
+
+ ACPI_FUNCTION_TRACE_PTR (DsAutoSerializeMethod, Node);
+
+
+ ACPI_DEBUG_PRINT ((ACPI_DB_PARSE,
+ "Method auto-serialization parse [%4.4s] %p\n",
+ AcpiUtGetNodeName (Node), Node));
+
+ /* Create/Init a root op for the method parse tree */
+
+ Op = AcpiPsAllocOp (AML_METHOD_OP);
+ if (!Op)
+ {
+ return_ACPI_STATUS (AE_NO_MEMORY);
+ }
+
+ AcpiPsSetName (Op, Node->Name.Integer);
+ Op->Common.Node = Node;
+
+ /* Create and initialize a new walk state */
+
+ WalkState = AcpiDsCreateWalkState (Node->OwnerId, NULL, NULL, NULL);
+ if (!WalkState)
+ {
+ return_ACPI_STATUS (AE_NO_MEMORY);
+ }
+
+ Status = AcpiDsInitAmlWalk (WalkState, Op, Node, ObjDesc->Method.AmlStart,
+ ObjDesc->Method.AmlLength, NULL, 0);
+ if (ACPI_FAILURE (Status))
+ {
+ AcpiDsDeleteWalkState (WalkState);
+ return_ACPI_STATUS (Status);
+ }
+
+ WalkState->DescendingCallback = AcpiDsDetectNamedOpcodes;
+
+ /* Parse the method, scan for creation of named objects */
+
+ Status = AcpiPsParseAml (WalkState);
+ if (ACPI_FAILURE (Status))
+ {
+ return_ACPI_STATUS (Status);
+ }
+
+ AcpiPsDeleteParseTree (Op);
+ return_ACPI_STATUS (Status);
+}
+
+
+/*******************************************************************************
+ *
+ * FUNCTION: AcpiDsDetectNamedOpcodes
+ *
+ * PARAMETERS: WalkState - Current state of the parse tree walk
+ * OutOp - Unused, required for parser interface
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Descending callback used during the loading of ACPI tables.
+ * Currently used to detect methods that must be marked serialized
+ * in order to avoid problems with the creation of named objects.
+ *
+ ******************************************************************************/
+
+static ACPI_STATUS
+AcpiDsDetectNamedOpcodes (
+ ACPI_WALK_STATE *WalkState,
+ ACPI_PARSE_OBJECT **OutOp)
+{
+
+ ACPI_FUNCTION_NAME (AcpiDsDetectNamedOpcodes);
+
+
+ /* We are only interested in opcodes that create a new name */
+
+ if (!(WalkState->OpInfo->Flags & (AML_NAMED | AML_CREATE | AML_FIELD)))
+ {
+ return (AE_OK);
+ }
+
+ /*
+ * At this point, we know we have a Named object opcode.
+ * Mark the method as serialized. Later code will create a mutex for
+ * this method to enforce serialization.
+ */
+ WalkState->MethodDesc->Method.InfoFlags |= ACPI_METHOD_SERIALIZED;
+
+ ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
+ "Method serialized [%4.4s] %p - [%s] (%4.4X)\n",
+ WalkState->MethodNode->Name.Ascii, WalkState->MethodNode,
+ WalkState->OpInfo->Name, WalkState->Opcode));
+
+ /* Abort the parse, no need to examine this method any further */
+
+ return (AE_CTRL_TERMINATE);
+}
+
+
+/*******************************************************************************
+ *
* FUNCTION: AcpiDsMethodError
*
* PARAMETERS: Status - Execution status