s390x/css: Don't save orb in subchannel.

Current css code saves the operation request block (orb) in the
subchannel structure for later consumption by the start function
handler. This might make sense for asynchronous execution of the
start function (which qemu doesn't support), but not in our case;
it would even be wrong since orb contains a reference to a local
variable in the base ssch handler.

Let's just pass the orb through the start function call chain for
ssch; for rsch, we can pass NULL as the backend function does not
use any information passed via the orb there.

Acked-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>

1 files changed, 8 insertions, 13 deletions

diff --git a/hw/s390x/css.c b/hw/s390x/css.c
index 7074d2b3d5..122cc7e66f 100644
--- a/hw/s390x/css.c
+++ b/hw/s390x/css.c
@@ -140,7 +140,6 @@ static void sch_handle_clear_func(SubchDev *sch)
     s->flags &= ~SCSW_FLAGS_MASK_PNO;
 
     /* We always 'attempt to issue the clear signal', and we always succeed. */
-    sch->orb = NULL;
     sch->channel_prog = 0x0;
     sch->last_cmd_valid = false;
     s->ctrl &= ~SCSW_ACTL_CLEAR_PEND;
@@ -163,7 +162,6 @@ static void sch_handle_halt_func(SubchDev *sch)
     path = 0x80;
 
     /* We always 'attempt to issue the halt signal', and we always succeed. */
-    sch->orb = NULL;
     sch->channel_prog = 0x0;
     sch->last_cmd_valid = false;
     s->ctrl &= ~SCSW_ACTL_HALT_PEND;
@@ -317,12 +315,11 @@ static int css_interpret_ccw(SubchDev *sch, hwaddr ccw_addr)
     return ret;
 }
 
-static void sch_handle_start_func(SubchDev *sch)
+static void sch_handle_start_func(SubchDev *sch, ORB *orb)
 {
 
     PMCW *p = &sch->curr_status.pmcw;
     SCSW *s = &sch->curr_status.scsw;
-    ORB *orb = sch->orb;
     int path;
     int ret;
 
@@ -331,6 +328,7 @@ static void sch_handle_start_func(SubchDev *sch)
 
     if (!(s->ctrl & SCSW_ACTL_SUSP)) {
         /* Look at the orb and try to execute the channel program. */
+        assert(orb != NULL); /* resume does not pass an orb */
         p->intparm = orb->intparm;
         if (!(orb->lpm & path)) {
             /* Generate a deferred cc 3 condition. */
@@ -406,7 +404,7 @@ static void sch_handle_start_func(SubchDev *sch)
  * read/writes) asynchronous later on if we start supporting more than
  * our current very simple devices.
  */
-static void do_subchannel_work(SubchDev *sch)
+static void do_subchannel_work(SubchDev *sch, ORB *orb)
 {
 
     SCSW *s = &sch->curr_status.scsw;
@@ -416,7 +414,7 @@ static void do_subchannel_work(SubchDev *sch)
     } else if (s->ctrl & SCSW_FCTL_HALT_FUNC) {
         sch_handle_halt_func(sch);
     } else if (s->ctrl & SCSW_FCTL_START_FUNC) {
-        sch_handle_start_func(sch);
+        sch_handle_start_func(sch, orb);
     } else {
         /* Cannot happen. */
         return;
@@ -594,7 +592,6 @@ int css_do_xsch(SubchDev *sch)
                  SCSW_ACTL_SUSP);
     sch->channel_prog = 0x0;
     sch->last_cmd_valid = false;
-    sch->orb = NULL;
     s->dstat = 0;
     s->cstat = 0;
     ret = 0;
@@ -618,7 +615,7 @@ int css_do_csch(SubchDev *sch)
     s->ctrl &= ~(SCSW_CTRL_MASK_FCTL | SCSW_CTRL_MASK_ACTL);
     s->ctrl |= SCSW_FCTL_CLEAR_FUNC | SCSW_FCTL_CLEAR_FUNC;
 
-    do_subchannel_work(sch);
+    do_subchannel_work(sch, NULL);
     ret = 0;
 
 out:
@@ -659,7 +656,7 @@ int css_do_hsch(SubchDev *sch)
     }
     s->ctrl |= SCSW_ACTL_HALT_PEND;
 
-    do_subchannel_work(sch);
+    do_subchannel_work(sch, NULL);
     ret = 0;
 
 out:
@@ -721,13 +718,12 @@ int css_do_ssch(SubchDev *sch, ORB *orb)
     if (channel_subsys->chnmon_active) {
         css_update_chnmon(sch);
     }
-    sch->orb = orb;
     sch->channel_prog = orb->cpa;
     /* Trigger the start function. */
     s->ctrl |= (SCSW_FCTL_START_FUNC | SCSW_ACTL_START_PEND);
     s->flags &= ~SCSW_FLAGS_MASK_PNO;
 
-    do_subchannel_work(sch);
+    do_subchannel_work(sch, orb);
     ret = 0;
 
 out:
@@ -957,7 +953,7 @@ int css_do_rsch(SubchDev *sch)
     }
 
     s->ctrl |= SCSW_ACTL_RESUME_PEND;
-    do_subchannel_work(sch);
+    do_subchannel_work(sch, NULL);
     ret = 0;
 
 out:
@@ -1267,7 +1263,6 @@ void css_reset_sch(SubchDev *sch)
 
     sch->channel_prog = 0x0;
     sch->last_cmd_valid = false;
-    sch->orb = NULL;
     sch->thinint_active = false;
 }