[PATCH] s390: multiple subchannel sets support

Add support for multiple subchannel sets.  Works with arbitrary devices in
subchannel set 1 and is transparent to device drivers.  Although currently
only two subchannel sets are available, this will work with the architectured
maximum number of subchannel sets as well.

Signed-off-by: Cornelia Huck <cohuck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

drivers/s390/cio/css.h

diff --git a/drivers/s390/cio/css.h b/drivers/s390/cio/css.h
index b74659c..251ebd7 100644
--- a/drivers/s390/cio/css.h
+++ b/drivers/s390/cio/css.h
@@ -77,6 +77,7 @@
 	unsigned long registered;
 	__u16 devno;		/* device number */
 	__u16 sch_no;		/* subchannel number */
+	__u8 ssid;              /* subchannel set id */
 	__u8 imask;		/* lpm mask for SNID/SID/SPGID */
 	int iretry;		/* retry counter SNID/SID/SPGID */
 	struct {
@@ -135,6 +136,7 @@
 extern int for_each_subchannel(int(*fn)(struct subchannel_id, void *), void *);
 
 #define __MAX_SUBCHANNEL 65535
+#define __MAX_SSID 3
 #define __MAX_CHPID 255
 #define __MAX_CSSID 0