1 files changed, 88 insertions, 0 deletions
diff --git a/arch/ppc64/kernel/HvLpEvent.c b/arch/ppc64/kernel/HvLpEvent.c
new file mode 100644
index 000000000000..9802beefa217
--- /dev/null
+++ b/arch/ppc64/kernel/HvLpEvent.c
@@ -0,0 +1,88 @@
+/*
+ * Copyright 2001 Mike Corrigan IBM Corp
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+#include <linux/stddef.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <asm/system.h>
+#include <asm/iSeries/HvLpEvent.h>
+#include <asm/iSeries/HvCallEvent.h>
+#include <asm/iSeries/LparData.h>
+
+/* Array of LpEvent handler functions */
+LpEventHandler lpEventHandler[HvLpEvent_Type_NumTypes];
+unsigned lpEventHandlerPaths[HvLpEvent_Type_NumTypes];
+
+/* Register a handler for an LpEvent type */
+
+int HvLpEvent_registerHandler( HvLpEvent_Type eventType, LpEventHandler handler )
+{
+	int rc = 1;
+	if ( eventType < HvLpEvent_Type_NumTypes ) {
+		lpEventHandler[eventType] = handler;
+		rc = 0;
+	}
+	return rc;
+	
+}
+
+int HvLpEvent_unregisterHandler( HvLpEvent_Type eventType )
+{
+	int rc = 1;
+
+	might_sleep();
+
+	if ( eventType < HvLpEvent_Type_NumTypes ) {
+		if ( !lpEventHandlerPaths[eventType] ) {
+			lpEventHandler[eventType] = NULL;
+			rc = 0;
+
+			/* We now sleep until all other CPUs have scheduled. This ensures that
+			 * the deletion is seen by all other CPUs, and that the deleted handler
+			 * isn't still running on another CPU when we return. */
+			synchronize_kernel();
+		}
+	}
+	return rc;
+}
+EXPORT_SYMBOL(HvLpEvent_registerHandler);
+EXPORT_SYMBOL(HvLpEvent_unregisterHandler);
+
+/* (lpIndex is the partition index of the target partition.  
+ * needed only for VirtualIo, VirtualLan and SessionMgr.  Zero
+ * indicates to use our partition index - for the other types)
+ */
+int HvLpEvent_openPath( HvLpEvent_Type eventType, HvLpIndex lpIndex )
+{
+	int rc = 1;
+	if ( eventType < HvLpEvent_Type_NumTypes &&
+	     lpEventHandler[eventType] ) {
+		if ( lpIndex == 0 )
+			lpIndex = itLpNaca.xLpIndex;
+		HvCallEvent_openLpEventPath( lpIndex, eventType );
+		++lpEventHandlerPaths[eventType];
+		rc = 0;
+	}
+	return rc;
+}
+
+int HvLpEvent_closePath( HvLpEvent_Type eventType, HvLpIndex lpIndex )
+{
+	int rc = 1;
+	if ( eventType < HvLpEvent_Type_NumTypes &&
+	     lpEventHandler[eventType] &&
+	     lpEventHandlerPaths[eventType] ) {
+		if ( lpIndex == 0 )
+			lpIndex = itLpNaca.xLpIndex;
+		HvCallEvent_closeLpEventPath( lpIndex, eventType );
+		--lpEventHandlerPaths[eventType];
+		rc = 0;
+	}
+	return rc;
+}
+