[S390] add PAV support to the dasd driver.

Add support for parallel-access-volumes to the dasd driver. This
allows concurrent access to dasd devices with multiple channel
programs.

Signed-off-by: Horst Hummel <horst.hummel@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 14 insertions, 2 deletions

diff --git a/drivers/s390/block/dasd_eckd.h b/drivers/s390/block/dasd_eckd.h
index 9d91c8632569..712ff1650134 100644
--- a/drivers/s390/block/dasd_eckd.h
+++ b/drivers/s390/block/dasd_eckd.h
@@ -41,9 +41,10 @@
 #define DASD_ECKD_CCW_RESERVE            0xB4
 
 /*
- *Perform Subsystem Function / Sub-Orders
+ * Perform Subsystem Function / Sub-Orders
  */
-#define PSF_ORDER_PRSSD                  0x18
+#define PSF_ORDER_PRSSD 0x18
+#define PSF_ORDER_SSC   0x1D
 
 /*****************************************************************************
  * SECTION: Type Definitions
@@ -353,4 +354,15 @@ struct dasd_psf_prssd_data {
         unsigned char varies[9];
 } __attribute__ ((packed));
 
+/*
+ * Perform Subsystem Function - Set Subsystem Characteristics
+ */
+struct dasd_psf_ssc_data {
+        unsigned char order;
+        unsigned char flags;
+        unsigned char cu_type[4];
+        unsigned char suborder;
+        unsigned char reserved[59];
+} __attribute__((packed));
+
 #endif                          /* DASD_ECKD_H */