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path: root/drivers/s390/cio/chp.h
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Diffstat (limited to 'drivers/s390/cio/chp.h')
-rw-r--r--drivers/s390/cio/chp.h12
1 files changed, 10 insertions, 2 deletions
diff --git a/drivers/s390/cio/chp.h b/drivers/s390/cio/chp.h
index 26c3d2246176..12b4903d6fe3 100644
--- a/drivers/s390/cio/chp.h
+++ b/drivers/s390/cio/chp.h
@@ -1,7 +1,7 @@
/*
* drivers/s390/cio/chp.h
*
- * Copyright IBM Corp. 2007
+ * Copyright IBM Corp. 2007,2010
* Author(s): Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
*/
@@ -10,6 +10,7 @@
#include <linux/types.h>
#include <linux/device.h>
+#include <linux/mutex.h>
#include <asm/chpid.h>
#include "chsc.h"
#include "css.h"
@@ -40,16 +41,23 @@ static inline int chp_test_bit(u8 *bitmap, int num)
struct channel_path {
+ struct device dev;
struct chp_id chpid;
+ struct mutex lock; /* Serialize access to below members. */
int state;
struct channel_path_desc desc;
/* Channel-measurement related stuff: */
int cmg;
int shared;
void *cmg_chars;
- struct device dev;
};
+/* Return channel_path struct for given chpid. */
+static inline struct channel_path *chpid_to_chp(struct chp_id chpid)
+{
+ return channel_subsystems[chpid.cssid]->chps[chpid.id];
+}
+
int chp_get_status(struct chp_id chpid);
u8 chp_get_sch_opm(struct subchannel *sch);
int chp_is_registered(struct chp_id chpid);