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s390x/css: Add a callback for when subchannel gets disabled 

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>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Thomas Huth 2014-12-11 14:25:11 +01:00 committed by Cornelia Huck
parent 6e7cd94462
commit 62ac4a52e2
2 changed files with 13 additions and 0 deletions
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12
hw/s390x/css.c
View File

@ -588,6 +588,7 @@ int css_do_msch(SubchDev *sch, const 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, const 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, const 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:
@ -1498,6 +1506,10 @@ 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 |

1
hw/s390x/css.h
View File

@ -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;
};