[PATCH v2 02/16] vfio/ccw: simplify the cp_get_orb interface

[Eric Farman <farman@xxxxxxxxxxxxx>]

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@xxxxxxxxxxxxx>
Signed-off-by: Eric Farman <farman@xxxxxxxxxxxxx>
Reviewed-by: Matthew Rosato <mjrosato@xxxxxxxxxxxxx>
---
 drivers/s390/cio/vfio_ccw_cp.c  | 9 ++++-----
 drivers/s390/cio/vfio_ccw_cp.h  | 2 +-
 drivers/s390/cio/vfio_ccw_fsm.c | 2 +-
 3 files changed, 6 insertions(+), 7 deletions(-)

diff --git a/drivers/s390/cio/vfio_ccw_cp.c b/drivers/s390/cio/vfio_ccw_cp.c
index 9e6df1f2fbee..a0060ef1119e 100644
--- a/drivers/s390/cio/vfio_ccw_cp.c
+++ b/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;
diff --git a/drivers/s390/cio/vfio_ccw_cp.h b/drivers/s390/cio/vfio_ccw_cp.h
index 16138a654fdd..fc31eb699807 100644
--- a/drivers/s390/cio/vfio_ccw_cp.h
+++ b/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);
 
diff --git a/drivers/s390/cio/vfio_ccw_fsm.c b/drivers/s390/cio/vfio_ccw_fsm.c
index 2784a4e4d2be..757b73141246 100644
--- a/drivers/s390/cio/vfio_ccw_fsm.c
+++ b/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;
-- 
2.34.1