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| author | Sascha Silbe <silbe@linux.vnet.ibm.com> | 2016-07-12 14:08:08 +0200 |
|---|---|---|
| committer | Cornelia Huck <cornelia.huck@de.ibm.com> | 2016-07-20 15:47:25 +0200 |
| commit | 727a0424dd77a2c9176d63e7b92d017ee3e8b761 (patch) | |
| tree | 72d5496f9b90eceba0000d689bec944c7c7d2078 | |
| parent | 485dd69088b6ff6cf1c1b6b2c8157c1c9846992a (diff) | |
| download | qemu-727a0424dd77a2c9176d63e7b92d017ee3e8b761.tar.gz | |
s390x/css: sch_handle_start_func() handles resume, too
It's not obvious from the code flow that sch_handle_start_func() gets
called for rsch. Add some comments explaining this.
Signed-off-by: Sascha Silbe <silbe@linux.vnet.ibm.com>
Reviewed-by: Halil Pasic <pasic@linux.vnet.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
| -rw-r--r-- | hw/s390x/css.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/hw/s390x/css.c b/hw/s390x/css.c index 9e98f50868..bb8e4be339 100644 --- a/hw/s390x/css.c +++ b/hw/s390x/css.c @@ -511,6 +511,7 @@ static void sch_handle_start_func(SubchDev *sch, ORB *orb) path = 0x80; if (!(s->ctrl & SCSW_ACTL_SUSP)) { + /* Start Function triggered via ssch, i.e. we have an ORB */ s->cstat = 0; s->dstat = 0; /* Look at the orb and try to execute the channel program. */ @@ -528,6 +529,8 @@ static void sch_handle_start_func(SubchDev *sch, ORB *orb) sch->ccw_no_data_cnt = 0; suspend_allowed = !!(orb->ctrl0 & ORB_CTRL0_MASK_SPND); } else { + /* Start Function resumed via rsch, i.e. we don't have an + * ORB */ s->ctrl &= ~(SCSW_ACTL_SUSP | SCSW_ACTL_RESUME_PEND); /* The channel program had been suspended before. */ suspend_allowed = true; @@ -610,6 +613,7 @@ static void do_subchannel_work(SubchDev *sch, ORB *orb) } else if (s->ctrl & SCSW_FCTL_HALT_FUNC) { sch_handle_halt_func(sch); } else if (s->ctrl & SCSW_FCTL_START_FUNC) { + /* Triggered by both ssch and rsch. */ sch_handle_start_func(sch, orb); } else { /* Cannot happen. */ |