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s390x/css: reflect cpa in scsw 

We neglected to update the the channel-program-address field of the scsw
after completion of the start or the halt function: Fortunately, Linux
didn't miss it so far. Let's update it for the cases where the cpa is
expected to be valid; in some cases, the cpa is 'unpredictable', so we
leave it untouched.

Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
This commit is contained in:
Cornelia Huck 2014-06-30 14:33:38 +02:00
parent 32a02d070b
commit 2ed982b6a9
1 changed files with 9 additions and 0 deletions
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9
hw/s390x/css.c
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@ -200,6 +200,7 @@ static void sch_handle_halt_func(SubchDev *sch)
PMCW *p = &sch->curr_status.pmcw;
SCSW *s = &sch->curr_status.scsw;
hwaddr curr_ccw = sch->channel_prog;
int path;
/* Path management: In our simple css, we always choose the only path. */
@ -216,6 +217,10 @@ static void sch_handle_halt_func(SubchDev *sch)
(s->ctrl & SCSW_ACTL_SUSP))) {
s->dstat = SCSW_DSTAT_DEVICE_END;
}
if ((s->ctrl & (SCSW_ACTL_SUBCH_ACTIVE | SCSW_ACTL_DEVICE_ACTIVE)) ||
(s->ctrl & SCSW_ACTL_SUSP)) {
s->cpa = curr_ccw + 8;
}
s->cstat = 0;
p->lpum = path;
@ -398,6 +403,7 @@ static void sch_handle_start_func(SubchDev *sch, ORB *orb)
s->ctrl |= SCSW_STCTL_PRIMARY | SCSW_STCTL_SECONDARY |
SCSW_STCTL_STATUS_PEND;
s->dstat = SCSW_DSTAT_CHANNEL_END | SCSW_DSTAT_DEVICE_END;
s->cpa = sch->channel_prog + 8;
break;
case -ENOSYS:
/* unsupported command, generate unit check (command reject) */
@ -408,6 +414,7 @@ static void sch_handle_start_func(SubchDev *sch, ORB *orb)
s->ctrl &= ~SCSW_CTRL_MASK_STCTL;
s->ctrl |= SCSW_STCTL_PRIMARY | SCSW_STCTL_SECONDARY |
SCSW_STCTL_ALERT | SCSW_STCTL_STATUS_PEND;
s->cpa = sch->channel_prog + 8;
break;
case -EFAULT:
/* memory problem, generate channel data check */
@ -416,6 +423,7 @@ static void sch_handle_start_func(SubchDev *sch, ORB *orb)
s->ctrl &= ~SCSW_CTRL_MASK_STCTL;
s->ctrl |= SCSW_STCTL_PRIMARY | SCSW_STCTL_SECONDARY |
SCSW_STCTL_ALERT | SCSW_STCTL_STATUS_PEND;
s->cpa = sch->channel_prog + 8;
break;
case -EBUSY:
/* subchannel busy, generate deferred cc 1 */
@ -436,6 +444,7 @@ static void sch_handle_start_func(SubchDev *sch, ORB *orb)
s->ctrl &= ~SCSW_CTRL_MASK_STCTL;
s->ctrl |= SCSW_STCTL_PRIMARY | SCSW_STCTL_SECONDARY |
SCSW_STCTL_ALERT | SCSW_STCTL_STATUS_PEND;
s->cpa = sch->channel_prog + 8;
break;
}
} while (ret == -EAGAIN);