[PATCH RFC v4 08/16] s390x/css: Add a callback for when subchannel gets disabled

Cornelia Huck
2014-11-27T15:16:41Z

From: Thomas Huth <thuth@linux.vnet.ibm.com>

We need a possibility to run code when a subchannel gets disabled.
This patch adds the necessary infrastructure.

Signed-off-by: Thomas Huth <thuth@linux.vnet.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
---
hw/s390x/css.c | 12 ++++++++++++
hw/s390x/css.h | 1 +
2 files changed, 13 insertions(+)

diff --git a/hw/s390x/css.c b/hw/s390x/css.c
index b67c039..735ec55 100644
--- a/hw/s390x/css.c
+++ b/hw/s390x/css.c
@@ -588,6 +588,7 @@ int css_do_msch(SubchDev *sch, SCHIB *orig_schib)
{
SCSW *s = &sch->curr_status.scsw;
PMCW *p = &sch->curr_status.pmcw;
+ uint16_t oldflags;
int ret;
SCHIB schib;

@@ -610,6 +611,7 @@ int css_do_msch(SubchDev *sch, SCHIB *orig_schib)
copy_schib_from_guest(&schib, orig_schib);
/* Only update the program-modifiable fields. */
p->intparm = schib.pmcw.intparm;
+ oldflags = p->flags;
p->flags &= ~(PMCW_FLAGS_MASK_ISC | PMCW_FLAGS_MASK_ENA |
PMCW_FLAGS_MASK_LM | PMCW_FLAGS_MASK_MME |
PMCW_FLAGS_MASK_MP);
@@ -625,6 +627,12 @@ int css_do_msch(SubchDev *sch, SCHIB *orig_schib)
(PMCW_CHARS_MASK_MBFC | PMCW_CHARS_MASK_CSENSE);
sch->curr_status.mba = schib.mba;

+ /* Has the channel been disabled? */
+ if (sch->disable_cb && (oldflags & PMCW_FLAGS_MASK_ENA) != 0
+ && (p->flags & PMCW_FLAGS_MASK_ENA) == 0) {
+ sch->disable_cb(sch);
+ }
+
ret = 0;

out:
@@ -1443,6 +1451,10 @@ void css_reset_sch(SubchDev *sch)
{
PMCW *p = &sch->curr_status.pmcw;

+ if ((p->flags & PMCW_FLAGS_MASK_ENA) != 0 && sch->disable_cb) {
+ sch->disable_cb(sch);
+ }
+
p->intparm = 0;
p->flags &= ~(PMCW_FLAGS_MASK_ISC | PMCW_FLAGS_MASK_ENA |
PMCW_FLAGS_MASK_LM | PMCW_FLAGS_MASK_MME |
diff --git a/hw/s390x/css.h b/hw/s390x/css.h
index 33104ac..7fa807b 100644
--- a/hw/s390x/css.h
+++ b/hw/s390x/css.h
@@ -81,6 +81,7 @@ struct SubchDev {
uint8_t ccw_no_data_cnt;
/* transport-provided data: */
int (*ccw_cb) (SubchDev *, CCW1);
+ void (*disable_cb)(SubchDev *);
SenseId id;
void *driver_data;
};
--
1.7.9.5