[S390] cio: notify drivers of channel path events

This patch adds a notification mechanism to inform ccw drivers
about changes to channel paths, which occured while the device
is online.

Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 12 insertions, 0 deletions

diff --git a/arch/s390/include/asm/ccwdev.h b/arch/s390/include/asm/ccwdev.h
index f3ba0fa98de6..e8501115eca8 100644
--- a/arch/s390/include/asm/ccwdev.h
+++ b/arch/s390/include/asm/ccwdev.h
@@ -92,6 +92,16 @@ struct ccw_device {
 };
 
 /*
+ * Possible events used by the path_event notifier.
+ */
+#define PE_NONE                         0x0
+#define PE_PATH_GONE                    0x1 /* A path is no longer available. */
+#define PE_PATH_AVAILABLE               0x2 /* A path has become available and
+                                               was successfully verified. */
+#define PE_PATHGROUP_ESTABLISHED        0x4 /* A pathgroup was reset and had
+                                               to be established again. */
+
+/*
  * Possible CIO actions triggered by the unit check handler.
  */
 enum uc_todo {
@@ -109,6 +119,7 @@ enum uc_todo {
  * @set_online: called when setting device online
  * @set_offline: called when setting device offline
  * @notify: notify driver of device state changes
+ * @path_event: notify driver of channel path events
  * @shutdown: called at device shutdown
  * @prepare: prepare for pm state transition
  * @complete: undo work done in @prepare
@@ -127,6 +138,7 @@ struct ccw_driver {
         int (*set_online) (struct ccw_device *);
         int (*set_offline) (struct ccw_device *);
         int (*notify) (struct ccw_device *, int);
+        void (*path_event) (struct ccw_device *, int *);
         void (*shutdown) (struct ccw_device *);
         int (*prepare) (struct ccw_device *);
         void (*complete) (struct ccw_device *);