vfio/ccw: simplify the cp_get_orb interface

There's no need to send in both the address of the subchannel
struct, and an element within it, to populate the ORB.

Pass the whole pointer and let cp_get_orb() take the pieces
that are needed.
Suggested-by: Matthew Rosato <mjrosato@linux.ibm.com>
Signed-off-by: Eric Farman <farman@linux.ibm.com>
Reviewed-by: Matthew Rosato <mjrosato@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>

drivers/s390/cio/vfio_ccw_cp.c

@@ -816,14 +816,13 @@ int cp_prefetch(struct channel_program *cp)
 /**
  * cp_get_orb() - get the orb of the channel program
  * @cp: channel_program on which to perform the operation
- * @intparm: new intparm for the returned orb
- * @lpm: candidate value of the logical-path mask for the returned orb
+ * @sch: subchannel the operation will be performed against
  *
  * This function returns the address of the updated orb of the channel
  * program. Channel I/O device drivers could use this orb to issue a
  * ssch.
  */
-union orb *cp_get_orb(struct channel_program *cp, u32 intparm, u8 lpm)
+union orb *cp_get_orb(struct channel_program *cp, struct subchannel *sch)
 {
 	union orb *orb;
 	struct ccwchain *chain;
@@ -835,12 +834,12 @@ union orb *cp_get_orb(struct channel_program *cp, u32 intparm, u8 lpm)
 
 	orb = &cp->orb;
 
-	orb->cmd.intparm = intparm;
+	orb->cmd.intparm = (u32)virt_to_phys(sch);
 	orb->cmd.fmt = 1;
 	orb->cmd.key = PAGE_DEFAULT_KEY >> 4;
 
 	if (orb->cmd.lpm == 0)
-		orb->cmd.lpm = lpm;
+		orb->cmd.lpm = sch->lpm;
 
 	chain = list_first_entry(&cp->ccwchain_list, struct ccwchain, next);
 	cpa = chain->ch_ccw;

drivers/s390/cio/vfio_ccw_cp.h

@@ -43,7 +43,7 @@ struct channel_program {
 int cp_init(struct channel_program *cp, union orb *orb);
 void cp_free(struct channel_program *cp);
 int cp_prefetch(struct channel_program *cp);
-union orb *cp_get_orb(struct channel_program *cp, u32 intparm, u8 lpm);
+union orb *cp_get_orb(struct channel_program *cp, struct subchannel *sch);
 void cp_update_scsw(struct channel_program *cp, union scsw *scsw);
 bool cp_iova_pinned(struct channel_program *cp, u64 iova, u64 length);
 

drivers/s390/cio/vfio_ccw_fsm.c

@@ -27,7 +27,7 @@ static int fsm_io_helper(struct vfio_ccw_private *private)
 
 	spin_lock_irqsave(sch->lock, flags);
 
-	orb = cp_get_orb(&private->cp, (u32)virt_to_phys(sch), sch->lpm);
+	orb = cp_get_orb(&private->cp, sch);
 	if (!orb) {
 		ret = -EIO;
 		goto out;