powerpc: Merge HvLpEvent.c into lpevents.c

These two files were intimately connected, so just merge them.

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>

1 files changed, 67 insertions, 1 deletions

diff --git a/arch/powerpc/platforms/iseries/lpevents.c b/arch/powerpc/platforms/iseries/lpevents.c
index 819298a8a4db..883603027ccf 100644
--- a/arch/powerpc/platforms/iseries/lpevents.c
+++ b/arch/powerpc/platforms/iseries/lpevents.c
@@ -18,6 +18,7 @@
 #include <asm/iSeries/ItLpQueue.h>
 #include <asm/iSeries/HvLpEvent.h>
 #include <asm/iSeries/HvCallEvent.h>
+#include <asm/iSeries/ItLpNaca.h>
 
 /*
  * The LpQueue is used to pass event data from the hypervisor to
@@ -42,7 +43,8 @@ static char *event_types[HvLpEvent_Type_NumTypes] = {
 };
 
 /* Array of LpEvent handler functions */
-extern LpEventHandler lpEventHandler[HvLpEvent_Type_NumTypes];
+static LpEventHandler lpEventHandler[HvLpEvent_Type_NumTypes];
+static unsigned lpEventHandlerPaths[HvLpEvent_Type_NumTypes];
 
 static struct HvLpEvent * get_next_hvlpevent(void)
 {
@@ -198,6 +200,70 @@ void setup_hvlpevent_queue(void)
         hvlpevent_queue.xIndex = 0;
 }
 
+/* Register a handler for an LpEvent type */
+int HvLpEvent_registerHandler(HvLpEvent_Type eventType, LpEventHandler handler)
+{
+        if (eventType < HvLpEvent_Type_NumTypes) {
+                lpEventHandler[eventType] = handler;
+                return 0;
+        }
+        return 1;
+}
+EXPORT_SYMBOL(HvLpEvent_registerHandler);
+
+int HvLpEvent_unregisterHandler(HvLpEvent_Type eventType)
+{
+        might_sleep();
+
+        if (eventType < HvLpEvent_Type_NumTypes) {
+                if (!lpEventHandlerPaths[eventType]) {
+                        lpEventHandler[eventType] = NULL;
+                        /*
+                         * 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_rcu();
+                        return 0;
+                }
+        }
+        return 1;
+}
+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)
+{
+        if ((eventType < HvLpEvent_Type_NumTypes) &&
+                        lpEventHandler[eventType]) {
+                if (lpIndex == 0)
+                        lpIndex = itLpNaca.xLpIndex;
+                HvCallEvent_openLpEventPath(lpIndex, eventType);
+                ++lpEventHandlerPaths[eventType];
+                return 0;
+        }
+        return 1;
+}
+
+int HvLpEvent_closePath(HvLpEvent_Type eventType, HvLpIndex lpIndex)
+{
+        if ((eventType < HvLpEvent_Type_NumTypes) &&
+                        lpEventHandler[eventType] &&
+                        lpEventHandlerPaths[eventType]) {
+                if (lpIndex == 0)
+                        lpIndex = itLpNaca.xLpIndex;
+                HvCallEvent_closeLpEventPath(lpIndex, eventType);
+                --lpEventHandlerPaths[eventType];
+                return 0;
+        }
+        return 1;
+}
+
 static int proc_lpevents_show(struct seq_file *m, void *v)
 {
         int cpu, i;